Exhibit 4.1.8

ADMISSION AGREEMENT AND AMENDMENT TO FOURTH AMENDED AND RESTATED

AGREEMENT OF LIMITED PARTNERSHIP

OF

INDEPENDENCE REALTY OPERATING PARTNERSHIP, LP

THIS ADMISSION AGREEMENT AND AMENDMENT (this “Agreement”), dated as of December 30, 2014 is entered into and among the Partnership, the General Partner and the New Limited Partner (as those terms are defined below).

WHEREAS, by Fourth Amended and Restated Agreement of Limited Partnership of Independence Realty Operating Partnership, LP dated as of May 7, 2013 (the “Partnership Agreement”) among Independence Realty Trust, Inc., a Maryland corporation (the “General Partner”), and IRT Limited Partner, LLC, a Delaware limited liability company (“IRT”) as a limited partner, a Delaware limited partnership was organized under the name Independence Realty Operating Partnership, LP (the “Partnership”); and

WHEREAS, the General Partner, pursuant to its authority under Section 4.2 of the Partnership Agreement, desires to admit USA IRR2, LLC, a Delaware limited liability company as a limited partner in the Partnership (“New Limited Partner”);

WHEREAS, capitalized terms used, but not defined herein have the means assigned to them in the Partnership Agreement;

NOW, THEREFORE, the parties hereto, intending to be legally bound hereby, agree as follows:

1. The Partnership hereby admits New Limited Partner as a Limited Partner in the Partnership with all of the rights and obligations of a Limited Partner in accordance with the terms and conditions of the Partnership Agreement, and the Partnership hereby issues to New Limited Partner the number of Common Units stated on Schedule A attached hereto. New Limited Partner has made a Capital Contribution of Contributed Property in exchange for such Common Unit(s).

2. Exhibit A to the Partnership Agreement is hereby amended and restated as set forth in Schedule B attached hereto.

3. The New Limited Partner has contributed as of the date hereof that certain real property and the improvements thereon commonly known as Iron Rock Ranch, 1215 W. Slaughter Lane, Austin, Texas, which shall be deemed Contributed Property. The Gross Asset Value of such Contributed Property is $8,550,245.90, and New Limited Partner’s Capital Account shall have a credit of such amount.

4. The New Limited Partner hereby joins in and agrees to be bound as a Limited Partner by the Partnership Agreement, as amended hereby, including without limitation the power of attorney granted in Section 2.4 of the Partnership Agreement.

5. The New Limited Partner, the General Partner and the Partnership are executing as of the date hereof that certain Exchange Rights Agreement.

6. This Agreement may be executed in counterparts.

[SIGNATURES APPEAR ON FOLLOWING PAGES]

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first above written.

- Limited Partner Admission to Operating Partnership -

- Limited Partner Admission to Operating Partnership -

SCHEDULE A

NEW LIMITED PARTNERS’ PARTNERSHIP INTERESTS

SCHEDULE B

PARTNERS’ PARTNERSHIP INTERESTS

Partners’ Partnership Interests

As of December 30, 2014