6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of: June 2025

Commission File Number: 001-35771

GRANITE REAL ESTATE INVESTMENT TRUST

(Name of registrant)

77 King Street West, Suite 4010, P.O. Box 159

Toronto-Dominion Centre

Toronto, Ontario

M5K 1H1

(Address of Principal Executive Office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F ☐   Form 40-F ☑

DOCUMENTS FILED AS PART OF THIS FORM 6-K

See the Exhibit Index to this Form 6-K.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

FORM 6-K EXHIBIT INDEX

EX-99.1

Exhibit 99.1

GRANITE REIT ANNOUNCES VOTING RESULTS FROM ITS

2025 ANNUAL GENERAL MEETING OF UNITHOLDERS

June 5, 2025, Toronto, Ontario, Canada - Granite Real Estate Investment Trust (“Granite REIT” or “Granite”) (TSX: GRT.UN / NYSE: GRP.U) announced today the results of the matters voted on at its annual general meeting of unitholders held virtually earlier today (the “Meeting”). Each of the individuals nominated for election as a trustee of Granite REIT, as set out in Granite’s Management Information Circular dated April 10, 2025, were elected as set out below.

A total of 46,975,817 units (76.33% of outstanding units) were represented in person or by proxy at the Meeting.

The results of the votes held at the Meeting are as follows:

ABOUT GRANITE

Granite is a Canadian-based REIT engaged in the acquisition, development, ownership and management of logistics, warehouse and industrial properties in North America and Europe. Granite owns 144 investment properties representing approximately 63.3 million square feet of leasable area.

77 King Street West, Suite 4010 P.O. Box 159 Toronto-Dominion Centre Toronto, ON, Canada M5K 1H1 T 647.925.7500 granitereit.com

OTHER INFORMATION

Copies of financial data and other publicly filed documents about Granite are available through the internet on the Canadian Securities Administrators’ System for Electronic Data Analysis and Retrieval+ (SEDAR+) which can be accessed at www.sedarplus.ca and on the United States Securities and Exchange Commission’s Electronic Data Gathering, Analysis and Retrieval System (EDGAR) which can be accessed at www.sec.gov.

For further information, please see our website at www.granitereit.com or contact Teresa Neto, Chief Financial Officer, at 647-925-7560 or Andrea Sanelli, Senior Director, Legal & Investor Services, at 647-925-7504.

77 King Street West, Suite 4010 P.O. Box 159 Toronto-Dominion Centre Toronto, ON, Canada M5K 1H1 T 647.925.7500 granitereit.com

EX-99.2

Exhibit 99.2

GRANITE REAL ESTATE INVESTMENT TRUST

(“Granite REIT” or “Granite”)

Report of Voting Results for Annual General Meeting of Unitholders

This report is being filed pursuant to section 11.3 of National Instrument 51-102 – Continuous DisclosureObligations and discloses the voting results for each matter voted upon at the annual general meeting (the “Meeting”) of holders of units (“Units”) of Granite REIT held on June 5, 2025.

A total of 46,975,817 Units (76.33% of outstanding Units) were represented in person or by proxy at the Meeting.