BCAP LLC Trust 2007-AA4

Mortgage Pass-Through Certificates

September 25, 2007 Distribution

External Parties

Table of Contents

Page

Servicer(s)

1. Certificate Payment Report

Chevy Chase Bank, F.S.B.

2. Collection Account Report

Countrywide Home Loans Servicing LP

3. Credit Enhancement Report

Wells Fargo Bank, National Association

4. Collateral Report

5. Delinquency Report

Underwriter(s)

6. REO Report

Barclays Capital Inc.

7. Foreclosure Report

8. Prepayment Report

9. Prepayment Detail Report

10. Realized Loss Report

11. Realized Loss Detail Report

12. Triggers and Adj. Cert. Report

13. Additional Certificate Report

14. Other Related Information

Total Number of Pages

Dates

Contacts

Cut-Off Date:

June 01, 2007

Amy Stoddard

Close Date:

June 29, 2007

Administrator

First Distribution Date:

July 25, 2007

(714) 247-6255

Amy.Stoddard@db.com

Address:

Distribution Date:

September 25, 2007

1761 East St. Andrew Place, Santa Ana, CA 92705

Record Date:

August 31, 2007

Factor Information:

(800) 735-7777

September 24, 2007

Main Phone Number:

(714) 247-6000

Determination Date:

September 18, 2007

https://www.tss.db.com/invr

Page 1 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution

Certificate Payment Report
Current Period Distribution - REMIC V
			Prior						Current
			Prior

	Class	Original	Principal			Total	Realized	Deferred	Principal

Class	Type	Face Value	Balance	Interest	Principal	Distribution	Loss	Interest	Balance
			(1)	(2)	(3)	(4)=(2)+(3)	(5)	(6)	(7)=(1)-(3)-(5)+(6)
I-1-A1	SR	234,935,000.00	231,564,268.77	1,207,713.31	4,521,058.64	5,728,771.95	0.00	0.00	227,043,210.13
I-1-A1	SR	234,935,000.00	231,564,268.77	1,207,713.31	4,521,058.64	5,728,771.95	0.00	0.00	227,043,210.13
I-1-A2	SR/SUP	17,864,000.00	17,607,696.16	91,832.17	343,772.50	435,604.67	0.00	0.00	17,263,923.66
I-2-A1	SR	112,755,000.00	110,506,979.86	544,279.67	2,303,337.91	2,847,617.58	0.00	0.00	108,203,641.95
I-2-A2	SR/SUP	8,575,000.00	8,404,038.42	43,423.36	175,168.49	218,591.85	0.00	0.00	8,228,869.93
I-3-A1	SR	116,285,000.00	114,120,771.37	559,764.61	771,470.08	1,331,234.69	0.00	0.00	113,349,301.29
I-3-A2	SR/SUP	8,843,000.00	8,678,419.24	42,567.82	58,667.15	101,234.97	0.00	0.00	8,619,752.09
I-B-1	SUB	12,294,000.00	12,291,739.45	63,005.77	1,156.65	64,162.42	0.00	0.00	12,290,582.80
I-B-2	SUB	7,751,000.00	7,749,574.79	39,723.26	729.23	40,452.49	0.00	0.00	7,748,845.56
I-B-3	SUB	5,078,000.00	5,077,066.29	26,024.35	477.75	26,502.10	0.00	0.00	5,076,588.54
I-2-X1	NTL	0.00	0.00	26,705.85	0.00	26,705.85	0.00	0.00	0.00
I-B-4	SUB	5,612,000.00	5,610,968.09	28,761.05	527.99	29,289.04	0.00	0.00	5,610,440.10
I-B-5	SUB	2,673,000.00	2,672,508.50	13,698.91	251.48	13,950.39	0.00	0.00	2,672,257.02
I-B-6	SUB	1,872,960.00	1,872,615.62	9,598.77	176.21	9,774.98	0.00	0.00	1,872,439.41
I-R	NPR	100.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00


Total		534,538,060.00	526,156,646.56	2,697,098.90	8,176,794.08	10,873,892.98	0.00	0.00	517,979,852.48
Total




Interest Accrual Detail Current Period Factor Information per $1,000 of Original Face Value
					Orig. Principal	Prior				Current
					Orig. Principal	Prior				Current
	Period	Period			(with Notional)	Principal			Total	Principal
Class	Starting	Ending	Method	Cusip	Balance	Balance	Interest	Principal	Distribution	Balance
			Method
					(1)	(1)	(2)	(3)	(4)=(2)+(3)	(5)

I-1-A1	08/01/07	08/30/07	A-30/360	05530WAA5	234,935,000.00	985.652494	5.140627	19.243870	24.384498	966.408624
I-1-A1	08/01/07	08/30/07	A-30/360	05530WAA5	234,935,000.00	985.652494	5.140627	19.243870	24.384498	966.408624
I-1-A2	08/01/07	08/30/07	A-30/360	05530WAB3	17,864,000.00	985.652494	5.140628	19.243870	24.384498	966.408624
I-2-A1	08/01/07	08/30/07	A-30/360	05530WAC1	112,755,000.00	980.062790	4.827100	20.427812	25.254912	959.634978
I-2-A2	08/01/07	08/30/07	A-30/360	05530WAD9	8,575,000.00	980.062790	5.063949	20.427812	25.491761	959.634977
I-3-A1	08/01/07	08/30/07	A-30/360	05530WAE7	116,285,000.00	981.388583	4.813730	6.634304	11.448034	974.754279
I-3-A2	08/01/07	08/30/07	A-30/360	05530WAF4	8,843,000.00	981.388583	4.813731	6.634304	11.448035	974.754279
I-B-1	08/01/07	08/30/07	A-30/360	05530WAG2	12,294,000.00	999.816126	5.124920	0.094082	5.219003	999.722043
I-B-2	08/01/07	08/30/07	A-30/360	05530WAH0	7,751,000.00	999.816126	5.124921	0.094082	5.219003	999.722044
I-B-3	08/01/07	08/30/07	A-30/360	05530WAJ6	5,078,000.00	999.816126	5.124921	0.094082	5.219004	999.722044
I-2-X1	08/01/07	08/30/07	A-30/360	05530WBA4	112,755,000.00	980.062790	0.236848	0.000000	0.236848	959.634978
I-B-4	08/01/07	08/30/07	A-30/360	05530WAK3	5,612,000.00	999.816124	5.124920	0.094082	5.219002	999.722042
I-B-5	08/01/07	08/30/07	A-30/360	05530WAL1	2,673,000.00	999.816124	5.124920	0.094082	5.219001	999.722043
I-B-6	08/01/07	08/30/07	A-30/360	05530WAM9	1,872,960.00	999.816131	5.124920	0.094081	5.219001	999.722050
I-R		05530WAN7	100.00	0.000000	0.000000	0.000000	0.000000	0.000000




Page 2 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution


Distribution to Date - REMIC V
									Current


	Original		Unscheduled	Scheduled	Total	Total	Realized	Deferred	Principal

Class	Face Value	Interest	Principal	Principal	Principal	Distribution	Loss	Interest	Balance
(1)	(2)	(3)	(4)	(5)=(3)+(4)	(6)=(2)+(5)	(7)	(8)	(9)=(1)-(5)-(7)+(8)
I-1-A1	234,935,000.00	3,647,366.15	7,825,122.05	66,667.82	7,891,789.87	11,539,156.02	0.00	0.00	227,043,210.13
I-1-A2	17,864,000.00	277,338.62	595,007.04	5,069.29	600,076.34	877,414.96	0.00	0.00	17,263,923.66
I-2-A1	112,755,000.00	1,647,460.10	4,521,759.40	29,598.65	4,551,358.05	6,198,818.15	0.00	0.00	108,203,641.95
I-2-A2	8,575,000.00	131,433.10	343,879.09	2,250.97	346,130.07	477,563.17	0.00	0.00	8,228,869.93
I-3-A1	116,285,000.00	1,700,180.48	2,904,123.63	31,575.08	2,935,698.71	4,635,879.19	0.00	0.00	113,349,301.29
I-3-A2	8,843,000.00	129,291.79	220,846.75	2,401.16	223,247.91	352,539.70	0.00	0.00	8,619,752.09
I-B-1	12,294,000.00	189,127.29	0.00	3,417.20	3,417.20	192,544.49	0.00	0.00	12,290,582.80
I-B-2	7,751,000.00	119,239.11	0.00	2,154.44	2,154.44	121,393.55	0.00	0.00	7,748,845.56
I-B-3	5,078,000.00	78,118.46	0.00	1,411.46	1,411.46	79,529.92	0.00	0.00	5,076,588.54
I-2-X1	0.00	80,789.45	0.00	0.00	0.00	80,789.45	0.00	0.00	0.00
I-B-4	5,612,000.00	86,333.36	0.00	1,559.90	1,559.90	87,893.26	0.00	0.00	5,610,440.10
I-B-5	2,673,000.00	41,120.65	0.00	742.98	742.98	41,863.63	0.00	0.00	2,672,257.02
I-B-6	1,872,960.00	28,813.07	0.00	520.59	520.59	29,333.66	0.00	0.00	1,872,439.41
I-R	100.00	0.53	99.00	1.00	100.00	100.53	0.00	0.00	0.00


Total	534,538,060.00	8,156,612.16	16,410,836.96	147,370.54	16,558,207.52	24,714,819.68	0.00	0.00	517,979,852.48


Interest Detail - REMIC V
	Pass	Prior Principal		Non-	Prior	Unscheduled		Paid or	Current
	Pass	Prior Principal		Non-	Prior	Unscheduled		Paid or

	Through	(with Notional)	Accrued	Supported	Unpaid	Interest	Optimal	Deferred	Unpaid

Class	Rate	Balance	Interest	Interest SF	Interest	Adjustment	Interest	Interest	Interest
			(1)	(2)	(3)	(4)	(5)=(1)-(2)+(3)+(4)	(6)	(7)=(5)-(6)
I-1-A1	6.25855%	231,564,268.77	1,207,713.31	0.00	0.00	0.00	1,207,713.31	1,207,713.31	0.00
I-1-A2	6.25855%	17,607,696.16	91,832.17	0.00	0.00	0.00	91,832.17	91,832.17	0.00
I-2-A1	5.91036%	110,506,979.86	544,279.66	0.00	0.00	0.00	544,279.66	544,279.67	0.00
I-2-A2	6.20036%	8,404,038.42	43,423.36	0.00	0.00	0.00	43,423.36	43,423.36	0.00
I-3-A1	5.88602%	114,120,771.37	559,764.61	0.00	0.00	0.00	559,764.61	559,764.61	0.00
I-3-A2	5.88602%	8,678,419.24	42,567.82	0.00	0.00	0.00	42,567.82	42,567.82	0.00
I-B-1	6.15104%	12,291,739.45	63,005.77	0.00	0.00	0.00	63,005.77	63,005.77	0.00
I-B-2	6.15104%	7,749,574.79	39,723.26	0.00	0.00	0.00	39,723.26	39,723.26	0.00
I-B-3	6.15104%	5,077,066.29	26,024.35	0.00	0.00	0.00	26,024.35	26,024.35	0.00
I-2-X1	0.29000%	110,506,979.86	26,705.85	0.00	0.00	0.00	26,705.85	26,705.85	0.00
I-B-4	6.15104%	5,610,968.09	28,761.05	0.00	0.00	0.00	28,761.05	28,761.05	0.00
I-B-5	6.15104%	2,672,508.50	13,698.91	0.00	0.00	0.00	13,698.91	13,698.91	0.00
I-B-6	6.15104%	1,872,615.62	9,598.77	0.00	0.00	0.00	9,598.77	9,598.77	0.00
I-R	0.00000%	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00


Total		636,663,626.42	2,697,098.89	0.00	0.00	0.00	2,697,098.89	2,697,098.90	0.00



Page 3 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution


Current Period Distribution - REMIC VI
			Prior						Current
			Prior

	Class	Original	Principal			Total	Realized	Deferred	Principal

Class	Type	Face Value	Balance	Interest	Principal	Distribution	Loss	Interest	Balance
			(1)	(2)	(3)	(4)=(2)+(3)	(5)	(6)	(7)=(1)-(3)-(5)+(6)
II-A-1	SR	229,133,000.00	213,080,381.02	987,834.73	2,718,621.75	3,706,456.48	0.00	0.00	210,361,759.27
II-A-1	SR	229,133,000.00	213,080,381.02	987,834.73	2,718,621.75	3,706,456.48	0.00	0.00	210,361,759.27
II-M-1	MEZ	9,423,000.00	9,423,000.00	45,582.45	0.00	45,582.45	0.00	0.00	9,423,000.00
II-M-2	MEZ	5,164,000.00	5,164,000.00	25,188.13	0.00	25,188.13	0.00	0.00	5,164,000.00
II-M-3	MEZ	1,678,000.00	1,678,000.00	8,455.02	0.00	8,455.02	0.00	0.00	1,678,000.00
II-M-4	MEZ	1,807,000.00	1,807,000.00	9,687.28	0.00	9,687.28	0.00	0.00	1,807,000.00
II-M-5	MEZ	1,678,000.00	1,678,000.00	9,468.81	0.00	9,468.81	0.00	0.00	1,678,000.00
II-M-6	MEZ	2,453,000.00	2,453,000.00	13,842.07	0.00	13,842.07	0.00	0.00	2,453,000.00
II-M-7	MEZ	2,194,000.00	2,194,000.00	12,380.56	0.00	12,380.56	0.00	0.00	2,194,000.00
II-CE	NOF	4,648,036.00	4,647,204.65	512,345.48	0.00	512,345.48	0.00	0.00	4,647,204.65
II-R	NOF/NPR	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00



Total		258,178,036.00	242,124,585.67	1,624,784.53	2,718,621.75	4,343,406.28	0.00	0.00	239,405,963.92
Total




Interest Accrual Detail Current Period Factor Information per $1,000 of Original Face Value
					Orig. Principal	Prior				Current
					Orig. Principal	Prior				Current
	Period	Period			(with Notional)	Principal			Total	Principal
	Period	Period
Class	Starting	Ending	Method	Cusip	Balance	Balance	Interest	Principal	Distribution	Balance

					(1)	(1)	(2)	(3)	(4)=(2)+(3)	(5)
II-A-1	08/27/07	09/24/07	A-Act/360	05530WAP2	229,133,000.00	929.941916	4.311185	11.864820	16.176005	918.077096
II-M-1	08/27/07	09/24/07	A-Act/360	05530WAQ0	9,423,000.00	1,000.000000	4.837361	0.000000	4.837361	1,000.000000
II-M-2	08/27/07	09/24/07	A-Act/360	05530WAR8	5,164,000.00	1,000.000000	4.877639	0.000000	4.877639	1,000.000000
II-M-3	08/27/07	09/24/07	A-Act/360	05530WAS6	1,678,000.00	1,000.000000	5.038749	0.000000	5.038749	1,000.000000
II-M-4	08/27/07	09/24/07	A-Act/360	05530WAT4	1,807,000.00	1,000.000000	5.360974	0.000000	5.360974	1,000.000000
II-M-5	08/27/07	09/24/07	A-Act/360	05530WAU1	1,678,000.00	1,000.000000	5.642914	0.000000	5.642914	1,000.000000
II-M-6	08/27/07	09/24/07	A-Act/360	05530WAV9	2,453,000.00	1,000.000000	5.642915	0.000000	5.642915	1,000.000000
II-M-7	08/27/07	09/24/07	A-Act/360	05530WAW7	2,194,000.00	1,000.000000	5.642917	0.000000	5.642917	1,000.000000
II-CE	08/25/07	09/24/07	05530WAY3	4,648,036.00	999.821140	110.228380	0.000000	110.228380	999.821140
II-R	08/25/07	09/24/07	05530WAX5	0.00	0.000000	0.000000	0.000000	0.000000	0.000000





Page 4 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution


Distribution to Date - REMIC VI
									Current


	Original		Unscheduled	Scheduled	Total	Total	Realized	Deferred	Principal

Class	Face Value	Interest	Principal	Principal	Principal	Distribution	Loss	Interest	Balance
(1)	(2)	(3)	(4)	(5)=(3)+(4)	(6)=(2)+(5)	(7)	(8)	(9)=(1)-(5)-(7)+(8)
II-A-1	229,133,000.00	3,052,392.77	0.00	18,771,240.73	18,771,240.73	21,823,633.50	0.00	0.00	210,361,759.27
II-M-1	9,423,000.00	135,462.17	0.00	0.00	0.00	135,462.17	0.00	0.00	9,423,000.00
II-M-2	5,164,000.00	74,867.24	0.00	0.00	0.00	74,867.24	0.00	0.00	5,164,000.00
II-M-3	1,678,000.00	25,147.86	0.00	0.00	0.00	25,147.86	0.00	0.00	1,678,000.00
II-M-4	1,807,000.00	28,848.01	0.00	0.00	0.00	28,848.01	0.00	0.00	1,807,000.00
II-M-5	1,678,000.00	28,224.19	0.00	0.00	0.00	28,224.19	0.00	0.00	1,678,000.00
II-M-6	2,453,000.00	41,259.80	0.00	0.00	0.00	41,259.80	0.00	0.00	2,453,000.00
II-M-7	2,194,000.00	36,903.38	0.00	0.00	0.00	36,903.38	0.00	0.00	2,194,000.00
II-CE	4,648,036.00	1,086,342.29	0.00	831.35	831.35	1,087,173.64	0.00	0.00	4,647,204.65
II-R	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00



Total	258,178,036.00	4,509,447.71	0.00	18,772,072.08	18,772,072.08	23,281,519.79	0.00	0.00	239,405,963.92


Interest Detail - REMIC VI
	Pass	Prior Principal		Non-	Prior	Unscheduled		Paid or	Current
	Pass	Prior Principal		Non-	Prior	Unscheduled		Paid or

	Through	(with Notional)	Accrued	Supported	Unpaid	Interest	Optimal	Deferred	Unpaid

Class	Rate	Balance	Interest	Interest SF	Interest	Adjustment	Interest	Interest	Interest
			(1)	(2)	(3)	(4)	(5)=(1)-(2)+(3)+(4)	(6)	(7)=(5)-(6)
II-A-1	5.75500%	213,080,381.02	987,834.73	0.00	0.00	0.00	987,834.73	987,834.73	0.00
II-M-1	6.00500%	9,423,000.00	45,582.45	0.00	0.00	0.00	45,582.45	45,582.45	0.00
II-M-2	6.05500%	5,164,000.00	25,188.13	0.00	0.00	0.00	25,188.13	25,188.13	0.00
II-M-3	6.25500%	1,678,000.00	8,455.02	0.00	0.00	0.00	8,455.02	8,455.02	0.00
II-M-4	6.65500%	1,807,000.00	9,687.28	0.00	0.00	0.00	9,687.28	9,687.28	0.00
II-M-5	7.00500%	1,678,000.00	9,468.81	0.00	0.00	0.00	9,468.81	9,468.81	0.00
II-M-6	7.00500%	2,453,000.00	13,842.07	0.00	0.00	0.00	13,842.07	13,842.07	0.00
II-M-7	7.00500%	2,194,000.00	12,380.56	0.00	0.00	0.00	12,380.56	12,380.56	0.00
II-CE	132.29772%	4,647,204.65	0.00	0.00	0.00	0.00	0.00	512,345.48	0.00
II-R	0.00000%	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00



Total		242,124,585.67	1,112,439.05	0.00	0.00	0.00	1,112,439.05	1,624,784.53	0.00



Page 5 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution

Collection Account Report
SUMMARY

	Group 2	Group 1	Total
Principal Collections	2,718,621.75	8,176,794.08	10,895,415.83
Principal Withdrawals	0.00	0.00	0.00
Principal Other Accounts	0.00	0.00	0.00
TOTAL NET PRINCIPAL	2,718,621.75	8,176,794.08	10,895,415.83
Interest Collections	1,574,554.95	2,724,782.45	4,385,607.02
Interest Withdrawals	-0.00	-0.00	-0.00
Interest Other Accounts	86,269.62	0.00	86,269.62
Interest Fees	-36,040.04	-27,683.55	-63,723.59
TOTAL NET INTEREST	1,538,514.91	2,697,098.90	4,321,883.43
TOTAL AVAILABLE FUNDS FOR DISTRIBUTION	4,257,136.66	10,873,892.98	15,217,299.26




PRINCIPAL - COLLECTIONS

	Group 2	Group 1	Total
Scheduled Principal Received	0.00	49,515.00	49,515.00
Curtailments	(133,730.54)	197,429.08	63,698.54
Prepayments In Full	2,852,352.29	7,929,850.00	10,782,202.29
Repurchased/Substitutions	0.00	0.00	0.00
Liquidations	0.00	0.00	0.00
Insurance Principal	0.00	0.00	0.00
Other Additional Principal	0.00	0.00	0.00
Delinquent Principal	-0.00	-32,595.00	-32,595.00
Realized Losses	-0.00	-0.00	-0.00
Advanced Principal	0.00	32,595.00	32,595.00
TOTAL PRINCIPAL COLLECTED	2,718,621.75	8,176,794.08	10,895,415.83




PRINCIPAL - WITHDRAWALS

SPACE INTENTIONALLY LEFT BLANK




PRINCIPAL - OTHER ACCOUNTS

	Group 2	Group 1	Total
TOTAL PRINCIPAL OTHER ACCOUNTS	0.00	0.00	0.00






Page 6 of 31

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Mortgage Pass-Through Certificates
September 25, 2007 Distribution


INTEREST - COLLECTIONS

	Group 2	Group 1	Total
Scheduled Interest	1,637,277.17	2,783,117.97	4,420,395.14
Repurchased/Substitution Interest	0.00	0.00	0.00
Liquidation Interest	0.00	0.00	0.00
Insurance Interest	0.00	0.00	0.00
Other Additional Interest
Prepayment Interest Shortfalls	-16,836.16	-18,125.83	-34,961.99
Delinquent Interest	-1,355,393.18	-1,917,822.46	-3,273,215.64
Compensating Interest	16,836.16	18,125.84	34,961.99
Civil Relief Act Shortfalls	-0.00	-0.00	-0.00
Interest Advanced	1,292,670.96	1,859,486.94	3,152,157.90
Interest Realized Loss	-0.00	-0.00	-0.00
TOTAL INTEREST COLLECTED	1,574,554.95	2,724,782.45	4,385,607.02




INTEREST - WITHDRAWALS

SPACE INTENTIONALLY LEFT BLANK




INTEREST - OTHER ACCOUNTS
INTEREST - OTHER ACCOUNTS
	Group 2	Group 1	Total
Prepayment Charges Collected. *
Prepayment Charges Waived. *
Prepayment Charges paid by the servicer.	86,269.62	0.00	86,269.62


TOTAL INTEREST OTHER ACCOUNTS	86,269.62	0.00	86,269.62


* Information not available with Trustee




INTEREST FEES
INTEREST FEES
	Group 2	Group 1	Total
Current Servicing Fees	12,941.71	26,715.80	39,657.52
Trustee Fees	0.00	0.00	0.00
PMI Insurer Fee	23,098.33	967.75	24,066.07
TOTAL INTEREST FEES	36,040.04	27,683.55	63,723.59



Page 7 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution

Credit Enhancement Report

ACCOUNTS


Capitalized Interest Account

Beginning Account Balance	0.00
Amount Deposited	0.00
Amount Withdrawn	0.00
Ending Account Balance	0.00


Excess Reserve Fund

Beginning Account Balance	0.00
Amount Deposited	0.00
Amount Withdrawn	0.00
Ending Account Balance	0.00




INSURANCE

SPACE INTENTIONALLY LEFT BLANK



STRUCTURAL FEATURES
STRUCTURAL FEATURES
		Group 2	Group 1	Total
Overcollateralized Amount - Prior Period		4,647,204.65		4,647,204.65
Current Period Principal Realized Losses		0.00		0.00
Overcollateralized Amount - After Current Losses		4,647,204.65		4,647,204.65

Extra Principal Distribution Amount		0.00		0.00
Overcollateralization Reduction Amount		0.00		0.00
Overcollateralized Amount - Ending		4,647,204.65		4,647,204.65

Overcollateralization Deficiency Amount		0.00		0.00
Overcollateralization Excess Amount		0.00		0.00
Specified Overcollateralization Amount		4,647,204.65		4,647,204.65

Net Monthly Excess Cashflow		426,075.86		426,075.86
Net Monthly Excess Cashflow Allocated to :
. a) Unpaid Interest Amounts		0.00		0.00
. b) Applied Realized Loss Amounts		0.00		0.00
. c) Basis Risk Carryforward Amounts		0.00		(0.01)


Page 8 of 31

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Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution

Collateral Report


COLLATERAL




		Group 2	Group 1	Total



Loan Count:


Original	365	777	1,142
Prior	489	768	1,257
Prefunding	0	0	0
Scheduled Paid Offs	-0	-0	-0
Full Voluntary Prepayments	-4	-10	-14
Repurchases	-0	-0	-0
Liquidations	-0	-0	-0
Current	485	758	1,243

Prior Count of Aggregate Loan Group II
Current Count of Aggregate Loan Group II
Principal Balance:


Original	201,178,035.84	534,538,059.65	735,716,095.49
Prior	242,124,585.67	526,156,646.21	768,281,231.88
Prefunding	0.00	0.00	0.00
Scheduled Principal	-0.00	-49,515.00	-49,515.00
Partial Prepayments	(133,730.54)	-197,429.08	-63,698.54
Full Voluntary Prepayments	-2,852,352.29	-7,929,850.00	-10,782,202.29
Repurchases	-0.00	-0.00	-0.00
Liquidations	-0.00	-0.00	-0.00
Current	239,405,963.92	517,979,852.13	757,385,816.05






PREFUNDING

	Group 2	Group 1	Total
Prefunding Account Original Balance	57,000,000.00		57,000,000.00
Prefunding Account Beginning Balance	0.00		0.00
Subsequent Loans Added to the Pool	0.00		0.00
Prefund Release to Certificate Holders	0.00		0.00
Prefunding Account Ending Balance	0.00	0.00	0.00






Page 9 of 31

BCAP LLC Trust 2007-AA4

Mortgage Pass-Through Certificates

September 25, 2007 Distribution



CHARACTERISTICS
CHARACTERISTICS

	Group 2	Group 1	Total
Weighted Average Coupon Original	8.02128%	6.35411%	6.80999%
Weighted Average Coupon Prior	8.13071%	6.34932%	6.91574%
Weighted Average Coupon Current	8.11189%	6.34743%	6.90350%
Weighted Average Months to Maturity Original	394	356	367
Weighted Average Months to Maturity Prior	392	355	367
Weighted Average Months to Maturity Current	391	354	366
Weighted Avg Remaining Amortization Term Original	394	356	367
Weighted Avg Remaining Amortization Term Prior	392	355	367
Weighted Avg Remaining Amortization Term Current	391	354	366
Weighted Average Seasoning Original	9.96	3.84	5.49
Weighted Average Seasoning Prior	9.14	4.84	6.19
Weighted Average Seasoning Current	10.14	5.82	7.19

Page 10 of 31

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Mortgage Pass-Through Certificates

September 25, 2007 Distribution



ARM CHARACTERISTICS
ARM CHARACTERISTICS

	Group 2	Group 1	Total
Weighted Average Margin Original	2.99636%	2.26156%	2.46249%
Weighted Average Margin Prior	3.10562%	2.26166%	2.53001%
Weighted Average Margin Current	3.10730%	2.26174%	2.52822%
Weighted Average Max Rate Original	11.90000%	11.40140%	11.53774%
Weighted Average Max Rate Prior	11.90000%	11.39703%	11.55696%
Weighted Average Max Rate Current	11.90000%	11.39546%	11.55447%
Weighted Average Min Rate Original	2.99636%	2.27615%	2.47309%
Weighted Average Min Rate Prior	3.10562%	2.27638%	2.54005%
Weighted Average Min Rate Current	3.10730%	2.27656%	2.53837%
Weighted Average Cap Up Original	0.00000%	1.99387%	1.44865%
Weighted Average Cap Up Prior	0.00000%	1.99381%	1.35985%
Weighted Average Cap Up Current	0.00000%	1.99377%	1.36543%
Weighted Average Cap Down Original	0.00000%	1.99387%	1.44865%
Weighted Average Cap Down Prior	0.00000%	1.99381%	1.35985%
Weighted Average Cap Down Current	0.00000%	1.99377%	1.36543%





Page 11 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution


SERVICING FEES & ADVANCES
SERVICING FEES & ADVANCES

	Group 2	Group 1	Total




Current Servicing Fees	12,941.71	26,715.80	39,657.52
Delinquent Servicing Fees	62,722.22	58,335.52	121,057.74
TOTAL SERVICING FEES	75,663.93	85,051.32	160,715.25


Total Servicing Fees	75,663.93	85,051.32	160,715.25
Compensating Interest	-16,836.16	-18,125.84	-34,961.99
Delinquent Servicing Fees	-62,722.22	-58,335.52	-121,057.74
COLLECTED SERVICING FEES	-3,894.45	8,589.96	4,695.52


Total Advanced Interest	1,292,670.96	1,859,486.94	3,152,157.90
Total Advanced Principal	0.00	32,595.00	32,595.00
Aggregate Advances with respect to this Distribution	1,292,670.96	1,892,081.93	3,184,752.89

Non Recoverable Advance	0.00	0.00	0.00




ADDITIONAL COLLATERAL INFORMATION
ADDITIONAL COLLATERAL INFORMATION
	Group 2	Group 1	Total
Prepayment Interest Shortfall (PPIS)	16,836.16	18,125.83	34,961.99
Compensating Interest	(16,836.16)	(18,125.84)	(34,961.99)
Net Prepayment Interest Shortfall (PPIS)	0.00	0.00	0.00

Weighted Average Net Mortgage Rate	7.625074%	6.151245%

Subsequent Recoveries	0.00	0.00	0.00
Pool Factor	0.93	0.97





Page 12 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution

Delinquency Report

TOTAL
		< 1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT	Balance		15,547,341.95	4,432,281.66	3,099,430.83	23,079,054.44
	% Balance		2.05%	0.59%	0.41%	3.05%
	# Loans		27	8	3	38
	% # Loans		2.17%	0.64%	0.24%	3.06%
FORECLOSURE	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
BANKRUPTCY	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
REO	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
TOTAL	Balance	0.00	15,547,341.95	4,432,281.66	3,099,430.83	23,079,054.44
	% Balance	0.00%	2.05%	0.59%	0.41%	3.05%
	# Loans	0	27	8	3	38
	% # Loans	0.00%	2.17%	0.64%	0.24%	3.06%

Page 13 of 31

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Mortgage Pass-Through Certificates
September 25, 2007 Distribution


GROUP 1
		< 1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT	Balance		6,631,157.66	2,909,448.40	1,500,000.00	11,040,606.06
	% Balance		1.28%	0.56%	0.29%	2.13%
	# Loans		13	5	2	20
	% # Loans		1.72%	0.66%	0.26%	2.64%
FORECLOSURE	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
BANKRUPTCY	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
REO	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
TOTAL	Balance	0.00	6,631,157.66	2,909,448.40	1,500,000.00	11,040,606.06
	% Balance	0.00%	1.28%	0.56%	0.29%	2.13%
	# Loans	0	13	5	2	20
	% # Loans	0.00%	1.72%	0.66%	0.26%	2.64%

Page 14 of 31

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Mortgage Pass-Through Certificates
September 25, 2007 Distribution


GROUP 2
		< 1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT	Balance		8,916,184.29	1,522,833.26	1,599,430.83	12,038,448.38
	% Balance		3.72%	0.64%	0.67%	5.03%
	# Loans		14	3	1	18
	% # Loans		2.89%	0.62%	0.21%	3.71%
FORECLOSURE	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
BANKRUPTCY	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
REO	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
TOTAL	Balance	0.00	8,916,184.29	1,522,833.26	1,599,430.83	12,038,448.38
	% Balance	0.00%	3.72%	0.64%	0.67%	5.03%
	# Loans	0	14	3	1	18
	% # Loans	0.00%	2.89%	0.62%	0.21%	3.71%

Page 15 of 31

BCAP LLC Trust 2007-AA4

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September 25, 2007 Distribution

REO Report

Loan Number

Original

Stated

Current

State &

First

Principal

Paid to

Note

LTV at

Original

Payment

Loan Group

Balance

Date

Rate

Origination

Term

Date

Page 16 of 31

BCAP LLC Trust 2007-AA4

Mortgage Pass-Through Certificates

September 25, 2007 Distribution

Foreclosure Report

Loan Number

Original

Stated

Current

State &

First

Principal

Paid to

Note

LTV at

Original

Payment

Loan Group

Balance

Date

Rate

Origination

Term

Date

Page 17 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution

Prepayment Report

VOLUNTARY PREPAYMENTS



		Group 2	Group 1	Total


Current


Number of Paid in Full Loans	4	10	14
Number of Repurchased Loans	0	0	0
Total Number of Loans Prepaid in Full	4	10	14
Curtailments Amount	(133,730.54)	197,429.08	63,698.54
Paid in Full Balance	2,852,352.29	7,929,850.00	10,782,202.29
Repurchased Loans Balance	0.00	0.00	0.00
Total Prepayment Amount	2,718,621.75	8,127,279.08	10,845,900.83
Cumulative


Number of Paid in Full Loans	25	19	44
Number of Repurchased Loans	0	0	0
Total Number of Loans Prepaid in Full	25	19	44
Paid in Full Balance	13,352,468.28	14,096,594.13	27,449,062.41
Repurchased Loans Balance	0.00	0.00	0.00
Curtailments Amount	(452,952.30)	2,314,242.84	1,861,290.54
Total Prepayment Amount	12,899,515.98	16,410,836.97	29,310,352.95

Page 18 of 31

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Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution


VOLUNTARY PREPAYMENTS RATES



		Group 2	Group 1	Total





SMM	1.12%	1.54%	1.41%
3 Months Avg SMM	1.91%	1.03%	1.29%
12 Months Avg SMM	1.91%	1.03%	1.29%
Avg SMM Since Cut-off	1.91%	1.03%	1.29%



CPR	12.67%	17.04%	15.69%
3 Months Avg CPR	20.69%	11.73%	14.40%
12 Months Avg CPR	20.69%	11.73%	14.40%
Avg CPR Since Cut-off	20.69%	11.73%	14.40%



PSA	624.84%	1,462.96%	1,091.07%
3 Months Avg PSA Approximation	1,061.30%	1,213.29%	1,144.16%
12 Months Avg PSA Approximation	1,061.30%	1,213.29%	1,144.16%
Avg PSA Since Cut-off Approximation	1,061.30%	1,213.29%	1,144.16%

Page 19 of 31

BCAP LLC Trust 2007-AA4

Mortgage Pass-Through Certificates

September 25, 2007 Distribution

PREPAYMENT CALCULATION METHODOLOGY

Single Monthly Mortality (SMM): (Voluntary partial and full prepayments + Repurchases + Liquidation Balance)/(Beg Principal Balance - Sched Principal)

Conditional Prepayment Rate (CPR): 1-((1-SMM)^12)

PSA Standard Prepayment Model: CPR/(0.20%*min(30,WAS))

Average SMM over period between nth month and mth month (AvgSMMn,m): 1 - [(1-SMMn)*(1-SMMn+1)*...*(1-SMMm)]^(1/months in period n,m)

Average CPR over period between the nth month and mth month (AvgCPRn,m): 1-((1-AvgSMMn,m)^12)

Average PSA Approximation over period between the nth month and mth month: AvgCPRn,m/(0.20%*Avg WASn,m))

Average WASn,m: (min(30,WASn)+min(30,WASn+1)+...+min(30,WASm)/(number of months in the period n,m)

Weighted Average Seasoning (WAS)

Note: Prepayment rates are calculated since deal issue date and include partial and full voluntary prepayments and repurchases.

Dates correspond to distribution dates.

Page 20 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution

Prepayment Detail Report

Prepayment Detail Report - Mortgage Loans Prepaid in Full During Current Distribution


Loan Number		Original			Current	State &	Type Prepayment	First


&	Loan	Principal	Prepayment	Prepayment	Note	LTV at	&	Payment

Loan Group	Status	Balance	Amount	Date	Rate	Origination	Original Term	Date

142981031 1		2,625,000.00	2,625,000.00	17-Aug-2007	6.750%	FL - 70.00%	Paid Off - 360	01-Dec-2006
142981031 1		2,625,000.00	2,625,000.00	17-Aug-2007	6.750%	FL - 70.00%	Paid Off - 360	01-Dec-2006
148430658 1		565,000.00	565,000.00	13-Aug-2007	6.750%	MD - 79.02%	Paid Off - 360	01-Apr-2007
157876550 1		491,250.00	491,250.00	21-Aug-2007	6.875%	NJ - 75.00%	Paid Off - 360	01-Apr-2007
164138243 1		798,200.00	798,200.00	13-Aug-2007	6.750%	NV - 77.87%	Paid Off - 360	01-May-2007
164245344 1		570,000.00	570,000.00	31-Aug-2007	6.250%	CA - 72.15%	Paid Off - 360	01-May-2007
164401303 1		990,000.00	990,000.00	27-Aug-2007	6.625%	MA - 55.00%	Paid Off - 360	01-May-2007
164401560 1		435,400.00	435,400.00	21-Aug-2007	6.750%	NC - 77.06%	Paid Off - 360	01-May-2007
164657764 1		536,000.00	536,000.00	13-Aug-2007	6.875%	CA - 80.00%	Paid Off - 360	01-May-2007
165284761 1		464,000.00	464,000.00	03-Aug-2007	7.000%	CA - 80.00%	Paid Off - 360	01-May-2007
165832189 1		455,000.00	455,000.00	27-Aug-2007	6.375%	CO - 65.00%	Paid Off - 360	01-May-2007
556031110 2		309,000.00	323,632.77	13-Aug-2007	8.125%	WA - 89.83%	Paid Off - 480	01-Jun-2006
556094183 2		1,587,000.00	1,650,173.24	01-Aug-2007	8.500%	FL - 49.59%	Paid Off - 480	01-Dec-2006
557005642 2		471,000.00	478,256.09	02-Aug-2007	8.125%	NV - 78.50%	Paid Off - 360	01-Apr-2007
567005863 2		393,700.00	400,290.19	15-Aug-2007	8.375%	CA - 63.50%	Paid Off - 480	01-Apr-2007


TOTAL	10,690,550.00	10,782,202.29

Page 21 of 31

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Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution

Realized Loss Report

COLLATERAL REALIZED LOSSES



		Group 2	Group 1	Total


Current





Number of Loans Liquidated		0	0	0
Collateral Principal Realized Loss/(Gain) Amount		0.00	0.00	0.00
Collateral Interest Realized Loss/(Gain) Amount		0.00	0.00	0.00
Net Liquidation Proceeds		0.00	0.00	0.00

Cumulative
Cumulative



Number of Loans Liquidated		0	0	0
Collateral Realized Loss/(Gain) Amount		0.00	0.00	0.00
Net Liquidation Proceeds		0.00	0.00	0.00





	Special Hazard Loss Coverage Amt for AggLnGrp1
	Fraud Loss Coverage Amt for AggLnGrp1
	Bankruptcy Loss Coverage Amt for AggLnGrp1

	Current Applied Realized Loss I-B-6				0.00
	Current Applied Realized Loss I-B-5				0.00
	Current Applied Realized Loss I-B-4				0.00
	Current Applied Realized Loss I-B-3				0.00
	Current Applied Realized Loss I-B-2				0.00
	Current Applied Realized Loss I-B-1				0.00

	Current Applied Realized Loss II-CE				0.00
	Current Applied Realized Loss II-M-7				0.00
	Current Applied Realized Loss II-M-6				0.00
	Current Applied Realized Loss II-M-5				0.00
	Current Applied Realized Loss II-M-4				0.00
	Current Applied Realized Loss II-M-3				0.00
	Current Applied Realized Loss II-M-2				0.00
	Current Applied Realized Loss II-M-1				0.00







Page 22 of 31

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Mortgage Pass-Through Certificates

September 25, 2007 Distribution




DEFAULT SPEEDS

	Group 2	Group 1	Total




MDR	0.00%	0.00%	0.00%
3 Months Avg MDR	0.00%	0.00%	0.00%
12 Months Avg MDR	0.00%	0.00%	0.00%
Avg MDR Since Cut-off	0.00%	0.00%	0.00%


CDR	0.00%	0.00%	0.00%
3 Months Avg CDR	0.00%	0.00%	0.00%
12 Months Avg CDR	0.00%	0.00%	0.00%
Avg CDR Since Cut-off	0.00%	0.00%	0.00%


SDA	0.00%	0.00%	0.00%
3 Months Avg SDA Approximation	0.00%	0.00%	0.00%
12 Months Avg SDA Approximation	0.00%	0.00%	0.00%
Avg SDA Since Cut-off Approximation	0.00%	0.00%	0.00%


Loss Severity Approximation for Current Period	0.00%	0.00%	0.00%
3 Months Avg Loss Severity Approximation	0.00%	0.00%	0.00%
12 Months Avg Loss Severity Approximation	0.00%	0.00%	0.00%
Avg Loss Severity Approximation Since Cut-off	0.00%	0.00%	0.00%







Page 23 of 31

BCAP LLC Trust 2007-AA4

Mortgage Pass-Through Certificates

September 25, 2007 Distribution

Page 24 of 31

BCAP LLC Trust 2007-AA4

Mortgage Pass-Through Certificates

September 25, 2007 Distribution

COLLATERAL REALIZED LOSS CALCULATION METHODOLOGY

Monthly Default Rate (MDR): (Beg Principal Balance of Liquidated Loans)/(Total Beg Principal Balance)

Conditional Default Rate (CDR): 1-((1-MDR)^12)

SDA Standard Default Assumption: CDR/IF(WAS<61,MIN(30,WAS)*0.02%,MAX(0.03%,MIN(30,WAS)*0.02%-0.0095%*(WAS-60)))

Average MDR over period between nth month and mth month (AvgMDRn,m): [(1-MDRn)*(1-MDRn+1)*...*(1-MDRm)]^(1/months in period n,m)

Average CDR over period between the nth month and mth month (AvgCDRn,m): 1-((1-AvgMDRn,m)^12)

Average SDA Approximation over period between the nth month and mth month:

AvgCDRn,m/IF(Avg WASn,m<61,MIN(30,Avg WASn,m)*0.02%,MAX(0.03%,MIN(30,Avg WASn,m)*0.02%-0.0095%*(Avg WASn,m-60)))

Average WASn,m: (WASn + WASn+1 +...+ WASm )/(number of months in the period n,m)

Loss Severity Approximation for current period: sum(Realized Loss Amount)/sum(Beg Principal Balance of Liquidated Loans)

Average Loss Severity Approximation over period between nth month and mth month: Avg(Loss Severityn,m)

Note: Default rates are calculated since deal issue date and include realized gains and additional realized losses and gains from prior periods.

Dates correspond to distribution dates.

Charged off or Partially Charged off Loans assumed to have a minimum 100% Loss Severity Percentage.

Page 25 of 31

BCAP LLC Trust 2007-AA4

Mortgage Pass-Through Certificates

September 25, 2007 Distribution

Realized Loss Detail Report

Loan Number

Current

State &

Prior

Realized

Cumulative

Loan

Note

LTV at

Original

Principal

Loss/(Gain)

Realized

Loan Group

Status

Rate

Origination

Term

Balance

Revision

Loss/(Gain)

TOTAL

Page 26 of 31

BCAP LLC Trust 2007-AA4

Mortgage Pass-Through Certificates

September 25, 2007 Distribution

Triggers and Adj. Cert. Report

TRIGGER EVENTS

Group 2

Group 1

Total

Stepdown Date has occurred

Step Down-Distribution Date July 2010

Trigger Event in effect

Delinquency %

0.6984%

60+ Day Deliquent Mortgage Loan Balance

3,122,264.09

Prior Pool Balance

242,124,585.67

526,156,646.21

Prior Senior Enhancement Percentage

11.9956%

Senior Specified Enhancement %

12.1318%

Cumulative Realized Loss

0.00

Cutoff Pool Balance

258,178,035.84

534,538,059.65

Realized Loss Percentage

0.0000%

Servicer Event of Default?

Has Optional Termination Date Reached ?

Does an Event of Default Exist?

Has BK Loss Cov. Term Date Occured ?

Has Fraud Loss Coverage Term Date Occured ?

Has Special Haz. Cov. Term Date Occured ?

ADJUSTABLE RATE CERTIFICATE INFORMATION

SPACE INTENTIONALLY LEFT BLANK

Page 27 of 31

BCAP LLC Trust 2007-AA4

Mortgage Pass-Through Certificates

September 25, 2007 Distribution

ADDITIONAL INFORMATION

Group 2

Group 1

Total

Senior Percentage

93.295823%

Subordinate Percentage

6.704177%

Senior Prepayment Percentage

100.000000%

Subordinate Prepayment Percentage

0.000000%

Subordinate Pass Through Rate

6.151035%

* Information not available with Trustee

Page 28 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution

Additional Certificate Report

ADDITIONAL CERTIFICATE REPORT

		NET WAC Shortfall Prior (1)	Int on Prior SF (2)	Curr NET WAC SF (3)	Total NET WAC SF (1+2+3)	NET WAC Shortfall Paid	NET WAC Shortfall UnPaid


CLASS
	II-A-1	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
	II-M-1	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
	II-M-2	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
	II-M-3	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
	II-M-4	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
	II-M-5	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
	II-M-6	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
	II-M-7	$0.00	$0.00	$0.00	$0.00	$-0.01	$0.00




Page 29 of 31

BCAP LLC Trust 2007-AA4

Mortgage Pass-Through Certificates

September 25, 2007 Distribution

ADDITIONAL CERTIFICATE REPORT

Next Pass Through Rate

CLASS

II-A-1

5.38120%

II-M-1

5.63120%

II-M-2

5.68120%

II-M-3

5.88120%

II-M-4

6.28120%

II-M-5

6.63120%

II-M-6

6.63120%

II-M-7

6.63120%

Page 30 of 31

BCAP LLC Trust 2007-AA4



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
September 25, 2007 Distribution

Other Related Information
ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
	Group 2	Group 1	Total
Current Scheduled Payments	1,637,277.17	2,832,632.97	4,469,910.14
Current Scheduled Payments 1 Month Prior	1,673,539.60	2,852,301.17	4,525,840.77
Current Scheduled Payments 2 Month Prior	1,344,755.27	2,879,229.47	4,223,984.74
Current Scheduled Payments 3 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 4 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 5 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 6 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 7 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 8 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 9 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 10 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 11 Month Prior	0.00	0.00	0.00


Sched. Payments for 60+Day Delinquent Loans	21,302.15	26,055.42	47,357.56
Sched. Pmts - 60+Day Delinquent Loans, 1 Month Prior	12,576.79	6,145.83	18,722.63
Sched. Pmts - 60+Day Delinquent Loans, 2 Month Prior	0.00	0.00	0.00
Sched. Pmts - 60+Day Delinquent Loans, 3 Month Prior	0.00	0.00	0.00
Sched. Pmts - 60+Day Delinquent Loans, 4 Month Prior	0.00	0.00	0.00
Sched. Pmts - 60+Day Delinquent Loans, 5 Month Prior	0.00	0.00	0.00
Sched. Pmts - 60+Day Delinquent Loans, 6 Month Prior	0.00	0.00	0.00
Sched. Pmts - 60+Day Delinquent Loans, 7 Month Prior	0.00	0.00	0.00
Sched. Pmts - 60+Day Delinquent Loans, 8 Month Prior	0.00	0.00	0.00
Sched. Pmts - 60+Day Delinquent Loans, 9 Month Prior	0.00	0.00	0.00
Sched. Pmts - 60+Day Delinquent Loans, 10 Month Prior	0.00	0.00	0.00
Sched. Pmts - 60+Day Delinquent Loans, 11 Month Prior	0.00	0.00	0.00








Page 31 of 31

BCAP LLC Trust 2007-AA4 10-D