EXHIBIT 2.1

AMENDMENT NO. 1 TO AMENDED AND RESTATED BUSINESS COMBINATION AGREEMENT

This Amendment No. 1, dated as of December 7, 2017 (this “Amendment”), to the Amended and Restated Business Combination Agreement (the “BCA”), dated as of September 11, 2017, by and among Estre Ambiental S.A., a sociedade anônima organized under the laws of Brazil (the “Company”), Boulevard Acquisition Corp II Cayman Holding Company, an exempted company limited by shares incorporated under the laws of the Cayman Islands (“Newco”), BII Merger Sub Corp., a Delaware corporation and a direct wholly owned subsidiary of Newco (“Merger Sub”), and Boulevard Acquisition Corp. II, a Delaware corporation (“Boulevard”).

WHEREAS, the Company, Newco, Merger Sub and Boulevard have previously entered into the BCA pursuant to which, among other things, the Company and Newco will complete a restructuring pursuant to, and substantially in accordance with, the steps set forth on Exhibit C to the BCA;

WHEREAS, pursuant to Section 7.5 of BCA, the parties desire to amend the BCA prior to the Effective Time.

NOW, THEREFORE, in consideration of the foregoing, the representations, warranties, covenants and agreements set forth in this Amendment, and other good and valuable consideration, the adequacy and receipt of which hereby are acknowledged, the parties hereby agree as follows:

1. Defined Terms. All capitalized terms used herein shall have the meanings set forth in the Merger Agreement, unless the context indicates otherwise.

2. Amendments to the BCA.

a. In the seventh “WHEREAS” clause of the BCA, the text “35,399,681” is hereby deleted and replaced with “29,384,854”;

b. In Section 5.6(c) of the BCA, the text “35,399,681” is hereby deleted and replaced with “29,384,854” and the text “32,438,237” is hereby deleted and replaced with “27,001,886”;

c. In Section 6.7(d) of the BCA, the text “35,399,681” is hereby deleted and replaced with “29,384,854” and the text “32,438,237” is hereby deleted and replaced with “27,001,886”; and

d. Exhibit C to the BCA is hereby amended by deleting the current text therein and inserting in lieu thereof the text set forth in Schedule A.

3. Entire Agreement. This Amendment, the BCA (together with the Schedules and Exhibits thereto) and the Confidentiality Agreement constitute the entire agreement among the parties

relating to the transactions contemplated by the BCA and supersede any other agreements, whether written or oral, that may have been made or entered into by or among any of the parties to the BCA or any of their respective Subsidiaries relating to the transactions contemplated by the BCA, including the Original BCA. No representations, warranties, covenants, understandings, agreements, oral or otherwise, relating to the transactions contemplated by this Agreement exist between the parties except as expressly set forth in this Amendment, the BCA and the Confidentiality Agreement.

4. Counterparts. This Amendment may be executed in any number of separate counterparts (including by means of facsimile or portable document format (.pdf)), each of which is an original but all of which taken together shall constitute one and the same instrument.

5. Governing Law. This Amendment shall be governed by and construed in accordance with the law of the State of Delaware without giving effect to any choice of law or conflict of law provision or rule (whether of the State of Delaware or any other jurisdiction) that would lead to the application of the laws of any other jurisdiction.

6. Miscellaneous.

a. Any conflict arising between this Amendment and the BCA shall be resolved in favor of the terms and intent of this Amendment.

b. Except as otherwise provided herein, the BCA shall remain unchanged and in full force and effect.

c. From and after the execution of this Amendment by the parties hereto, any reference to the BCA shall be deemed to be a reference to the BCA as amended by this Amendment.

[SIGNATURE PAGE FOLLOWS]

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed as of the day and year first above written.

	COMPANY:

	ESTRE AMBIENTAL S.A.


	By:	/s/ Sergio Pedreiro
		Name: Sergio Pedreiro
		Title: Presidente


	By:	/s/ Roberto Nakagome
		Name: Roberto Nakagome
		Title: Director Financeiro


	NEWCO:

	BOULEVARD ACQUISITION CORP II CAYMAN HOLDING COMPANY


	By:	/s/ David Phillips
		Name: David Phillips
		Title: Chief Executive Officer, Chief Financial Officer and Director


	MERGER SUB:

	BII MERGER SUB CORP.


	By:	/s/ David Phillips
		Name: David Phillips
		Title: Sole Director, Chairman, President, Treasurer and Secretary


	BOULEVARD:

	BOULEVARD ACQUISITION CORP. II


	By:	/s/ Stephen Trevor
		Name: Stephen Trevor
		Title: Chief Executive Officer

[Signature Page to Amendment No. 1 to Business Combination Agreement]

BOULEVARD ACQUISITION CORP. II 8-K