SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

Brookfield Canada Office Properties

(Name of Issuer)

Trust Units

(Title of Class of Securities)

112823109

(CUSIP Number)

December 31, 2013

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

¨ Rule 13d-1(b)

¨ Rule 13d-1(c)

x Rule 13d-1(d)

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (the “Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes.)

Brookfield Canada Office Properties (“BOXC”)

Brookfield Place

181 Bay Street, Suite 330

Toronto, Ontario, Canada, M5J 2T3

Brookfield Asset Management Inc. (“BAM”)

Partners Limited (“Partners”)

Brookfield Property Partners L.P. (“BPY”)

Brookfield Office Properties Inc. (“BPO”)

The address of each of BAM, Partners and BPO is:

Brookfield Place

181 Bay Street, Suite 330

Toronto, Ontario, Canada, M5J 2T3

The address of BPY is:

73 Front Street

Hamilton

HM 12 Bermuda

See Item 4 of the cover pages

Trust Units (“Trust Units”)

112823109

See Item 9 of the cover pages. BPO, indirectly through BPO Properties Ltd., a wholly-owned subsidiary of BPO, beneficially owns 10,564,117 Trust Units and 67,088,022 Class B LP Units (“Class B LP Units”) of Brookfield Office Properties Canada LP, a subsidiary of BOXC, which are exchangeable on a one-for-one basis (subject to customary anti-dilution provisions) for Trust Units at the option of the holder at any time unless such exchange would, in the opinion of the trustees of BOXC, jeopardize BOXC’s status as a “unit trust”, “mutual fund trust” or “real estate investment trust” under the Income Tax Act (Canada). BPY owns 49.2 percent of BPO’s outstanding common shares and 97.2 percent of BPO’s outstanding voting preferred shares and therefore may be deemed to

beneficially own 77,652,139 Trust Units indirectly through BPO. BAM owns 41,394,118 limited partnership units of BPY (“BPY Units”), 389,129,306 limited partnership interests in a subsidiary of BPY, which are redeemable for cash, subject to the right of BPY to acquire such interests (in lieu of such redemption) in exchange for BPY Units, a special limited partner interest in a subsidiary of BPY and a general partner interest in BPY’s general partner, together representing an effective economic interest in BPY of 89 percent, and therefore may be deemed to beneficially own 77,652,139 Trust Units indirectly through BPY and BPO. Partners owns all of BAM’s Class B Limited Voting Shares and therefore may be deemed to beneficially own 77,652,139 Trust Units indirectly through BAM, BPY and BPO.

See Item 11 of the cover pages.

See Item 5 of the cover pages.

See Item 6 of the cover pages.

See Item 7 of the cover pages.

See Item 8 of the cover pages.

Not applicable

Not applicable

Not applicable

Not applicable

Not applicable

Not applicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Exhibit 99.1

JOINT FILING AGREEMENT

We, the signatories of the Statement on Schedule 13G to which this Joint Filing Agreement is attached, hereby agree that such statement is, and any amendments thereto filed by any of us will be, filed on behalf of each of us pursuant to and in accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended.