Exhibit 10.8

Property Name: Spring Creek Apartments

ASSIGNMENT OF MANAGEMENT AGREEMENT AND

SUBORDINATION OF MANAGEMENT FEES

THIS ASSIGNMENT OF MANAGEMENT AGREEMENT AND SUBORDINATION OF MANAGEMENT FEES (“Assignment”) is made effective as of the 9th day of March, 2012, by and among SIR SPRING CREEK, LLC, a Delaware limited liability company, having its principal place of business at c/o Steadfast Asset Holdings, Inc., 18100 Von Karman Ave., Suite 500, Irvine, California 92612 (“New Borrower”), U.S. BANK NATIONAL ASSOCIATION, as Trustee for the registered holders of J.P. MORGAN CHASE COMMERCIAL MORTGAGE SECURITIES CORP., MULTIFAMILY MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 2011-K702, having an address at c/o Wells Fargo Bank, N.A., Commercial Mortgage Servicing, 1901 Harrison Street, 7th Floor, Oakland, California 94612 (together with its successors and assigns, “Noteholder”), and STEADFAST MANAGEMENT COMPANY, INC., a California corporation, having its principal place of business at 18100 Von Karman Ave., Suite 500, Irvine, California 92612 (“Property Manager”).

RECITALS:

A. Noteholder is the current holder of a Multifamily Note dated as of January 31, 2011 (“Note”), evidencing a loan being assumed by New Borrower as of the date hereof in the amount of Fourteen Million One Hundred Thousand and 00/100 Dollars ($14,100,000.00) (“Loan”). The Note is secured by, among other things, a Multifamily Mortgage, Assignment of Rents and Security Agreement (“Security Instrument”), dated as of January 31, 2011, which grants Lender a first lien on the property encumbered by the Security Instrument (“Mortgaged Property”). The Note, the Security Instrument, this Assignment and any of the other documents evidencing the Loan are collectively referred to as the “Loan Documents”. Other capitalized terms used but not defined in this Assignment will have the meanings given to such terms in the Security Instrument.

B. Pursuant to a certain Management Agreement between New Borrower and Property Manager (“Management Agreement”) (a true and correct copy of which Management Agreement is attached as Exhibit A), New Borrower employed Property Manager exclusively to lease, operate and manage the Mortgaged Property and Property Manager is entitled to certain management fees (“Management Fees”) pursuant to the Management Agreement.

C. Noteholder requires as a condition to New Borrower’s assumption of the Loan that New Borrower assign the Management Agreement and that Property Manager subordinate its interest in the Management Fees in lien and payment to the Mortgage as set forth below.

D. For purposes of this Assignment, New Borrower shall be referred to hereinafter as “Borrower” and Noteholder as “Lender”.

AGREEMENT:

For good and valuable consideration the parties agree as follows:

1. Assignment of Management Agreement. As additional collateral security for the Loan, Borrower hereby conditionally transfers, sets over and assigns to Lender all of Borrower’s right, title and interest in and to the Management Agreement and all extensions and renewals, said transfer and assignment to automatically become a present, unconditional

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assignment, at Lender’s option, in the event of a default by Borrower under the Note, the Security Instrument or any of the other Loan Documents (each, an “Event of Default”), and the failure of Borrower to cure such Event of Default within any applicable grace period.

2. Subordination of Management Fees. The Management Fees and all rights and privileges of Property Manager to the Management Fees are hereby and will at all times continue to be subject and unconditionally subordinate in all respects in lien and payment to the lien and payment of the Security Instrument, the Note and the other Loan Documents and to any renewals, extensions, modifications, assignments, replacements, or consolidations thereof and the rights, privileges, and powers of Lender under the Note, the Security Instrument or any of the other Loan Documents.

3. Estoppel. Property Manager and Borrower represent and warrant that all of the following are true:

4. Agreement by Borrower and Property Manager. Borrower and Property Manager agree that if there is an Event of Default by Borrower (continuing beyond any applicable grace period) under the Note, the Security Instrument or any of the other Loan Documents during the term of this Assignment or upon the occurrence of any event which would entitle Lender to terminate the Management Agreement in accordance with the terms of the Loan Documents, Lender may terminate the Management Agreement without payment of any cancellation fee or penalty and require Property Manager to transfer its responsibility for the management of the Mortgaged Property to a management company selected by Lender in Lender’s sole discretion, effective as of the date set forth in Lender’s notice to Property Manager. Following any such termination, Property Manager agrees to apply all rents, security deposits, issues, proceeds and profits of the Mortgaged Property in accordance with Lender’s written directions to Property Manager.

5. Lender’s Right to Replace Property Manager. In addition to the foregoing, in the event that Lender, in Lender’s reasonable discretion, at any time during the term of this Assignment, determines that the Mortgaged Property is not being managed in accordance with generally accepted management practices for properties similar to the Mortgaged Property, Lender will deliver written notice to Borrower and Property Manager, which notice will specify with particularity the grounds for Lender’s determination. If Lender reasonably determines that the conditions specified in Lender’s notice are not remedied to Lender’s reasonable satisfaction by Borrower or Property Manager within 30 days from receipt of such notice or that Borrower or Property Manager have failed to diligently undertake correcting such conditions within such 30

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day period, Lender may direct Borrower to terminate Property Manager as manager of the Mortgaged Property and terminate the Management Agreement without payment of any cancellation fee or penalty and to replace Property Manager with a management company acceptable to Lender in Lender’s sole discretion pursuant to a management agreement acceptable to Lender in Lender’s sole discretion.

6. Receipt of Management Fees. Borrower and Property Manager agree that in no event shall the Management Fees exceed five percent (5.0%) of the gross revenues derived from the Mortgaged Property on an annual basis. Property Manager will not be obligated to return or refund to Lender any Management Fees or other fee, commission or other amount received by Property Manager prior to the occurrence of the Event of Default, and to which Property Manager was entitled under the Management Agreement. If the Property Manager receives any Management Fees after it has received notice of an Event of Default, Property Manager hereby agrees that such Management Fees will be received and held in trust for Lender, to be applied by Lender to amounts due under the Note, Security Instrument or any other Loan Documents.

7. Consent and Agreement by Property Manager. Property Manager acknowledges and consents to this Assignment and agrees that Property Manager will act in conformity with the provisions of this Assignment and Lender’s rights hereunder or otherwise related to the Management Agreement. In the event that the responsibility for the management of the Mortgaged Property is transferred from Property Manager in accordance with the provisions of this Assignment, Property Manager will fully cooperate in transferring its responsibility to a new management company and effectuate such transfer no later than 30 days from the date the Management Agreement is terminated. Further, Property Manager agrees as follows:

8. Termination. At such time as the Loan is paid in full and the Security Instrument is released or assigned of record, this Assignment and all of Lender’s right, title and interest hereunder with respect to the Management Agreement will terminate.

9. Notices. All notices under or concerning this Assignment must be in writing and must be given in accordance with Section 31 of the Security Instrument.

10. Governing Law. Except as otherwise expressly stated in this Assignment, this Assignment will be construed in accordance with and governed by the laws of the Property Jurisdiction.

11. Captions, Cross References and Exhibits. The captions assigned to provisions of this Assignment are for convenience only and will be disregarded in construing this Assignment. Any reference in this Assignment to an “Exhibit” or a “Section”, unless otherwise explicitly provided, will be construed as referring, respectively, to an Exhibit attached to this Assignment or to a section of this Assignment. All Exhibits attached to or referred to in this Assignment are incorporated by reference into this Assignment.

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12. Number and Gender. Use of the singular in this Assignment includes the plural, use of the plural includes the singular, and use of one gender includes all other genders, as the context may require.

13. No Partnership. This Assignment is not intended to, and will not, create a partnership or joint venture among the parties, and no party to this Assignment will have the power or authority to bind any other party except as explicitly provided in this Assignment.

14. Severability. The invalidity or unenforceability of any provision of this Assignment will not affect the validity of any other provision, and all other provisions will remain in full force and effect.

15. Entire Assignment. This Assignment contains the entire agreement among the parties as to the rights granted and the obligations assumed in this Assignment.

16. Waiver; No Remedy Exclusive. Any forbearance by a party to this Assignment in exercising any right or remedy given under this Assignment or existing at law or in equity will not constitute a waiver of or preclude the exercise of that or any other right or remedy. Unless otherwise explicitly provided, no remedy under this Assignment is intended to be exclusive of any other available remedy, but each remedy will be cumulative and will be in addition to other remedies given under this Assignment or existing at law or in equity.

17. Third Party Beneficiaries. Neither any creditor of any party to this Assignment, nor any other person, is intended to be a third party beneficiary of this Assignment.

18. Further Assurances and Corrective Instruments. To the extent permitted by law, the parties will, from time to time, execute, acknowledge and deliver, or cause to be executed, acknowledged and delivered, such supplements to this Assignment and such further instruments as may reasonably be required for carrying out the intention of or facilitating the performance of this Assignment.

19. Counterparts. This Assignment may be executed in multiple counterparts, each of which will constitute an original document and all of which together will constitute one agreement.

20. Indemnity. By executing this Assignment Borrower agrees to indemnify and hold harmless Lender and its successors and assigns from and against any and all losses, claims, damages, liabilities and expenses including, without limitation, attorneys’ fees and disbursements, which may be imposed or incurred in connection with this Assignment.

21. Costs and Expenses. Wherever pursuant to this Assignment it is provided that Borrower will pay any costs and expenses, such costs and expenses will include, but not be limited to, legal fees and disbursements of Lender, whether retained firms, the reimbursement for the expenses of in-house staff or otherwise.

22. Determinations by Lender. In any instance where the consent or approval of Lender may be given or is required, or where any determination, judgment or decision is to be rendered by Lender under this Assignment, the granting, withholding or denial of such consent or approval and the rendering of such determination, judgment or decision will be made or exercised by Lender (or its designated representative) at its sole and exclusive option and in its sole and absolute discretion and will be final and conclusive, except as may be otherwise expressly and specifically provided in this Assignment.

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23. Successors and Assigns. This Assignment will be binding upon and inure to the benefit of Borrower, Lender and Property Manager and their respective successors and assigns forever.

[Remainder of Page Intentionally Left Blank. Signatures Begin on Next Page.]

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IN WITNESS WHEREOF the undersigned have executed this Assignment as of the date and year first written above.

Signature page to Assignment of Management Agreement

EXHIBIT A

MANAGEMENT AGREEMENT