Seller refused to close the deal.
The Rayat et al v. Salmon et al, 2018 ONSC 6169 (CanLII), case is an example of a breach by seller. In that case, the Rayats entered into an APS with the sellers for their house in Brampton, which was scheduled to close in July 2016. Minor issues arose around closing (several thousand dollars of damage to the property was discovered), after which the seller refused to close. The buyers (Rayats) sued for specific performance (to acquire the property for the price agreed to in the APS) along with damages, and the seller was found to be in breach of contract.
If the buyer is ready to close, and for whatever reason the seller has a last minute change of mind and refuses to close, the buyer may be entitled to damages and/or specific performance forcing the seller to close. In Semelhago v Paramadevan  2 SCR 415, the Supreme Court of Canada held that whether or not a buyer is entitled to specific performance depends on how “unique” the property in question is. Courts will take into account both objective and subjective factors when determining whether the test for uniqueness is met (see, for example, Marvost v Stokes, 2011 ONSC 4827, aff’d 2012 ONCA 74).
The Buyer, not the seller, has the option to close the deal if something unexpected happens.
Agreement of Purchase and Sale (OREA)
10. TITLE: Provided that the title to the property is good and free from all registered restrictions, charges, liens, and encumbrances except as otherwise specifically provided in this Agreement and save and except for (a) any registered restrictions or covenants that run with the land providing that such are complied with; (b) any registered municipal agreements and registered agreements with publicly regulated utilities providing such have been complied with, or security has been posted to ensure compliance and completion, as evidenced by a letter from the relevant municipality or regulated utility; (c) any minor easements for the supply of domestic utility or telecommunication services to the property or adjacent properties; and (d) any easements for drainage, storm or sanitary sewers, public utility lines, telecommunication lines, cable television lines or other services which do not materially affect the use of the property. If within the specified times referred to in paragraph 8 any valid objection to title or to any outstanding work order or deficiency notice, or to the fact the said present use may not lawfully be continued, or that the principal building may not be insured against risk of fire is made in writing to Seller and which Seller is unable or unwilling to remove, remedy or satisfy or obtain insurance save and except against risk of fire (Title Insurance) in favour of the Buyer and any mortgagee, (with all related costs at the expense of the Seller), and which Buyer will not waive, this Agreement notwithstanding any intermediate acts or negotiations in respect of such objections, shall be at an end and all monies paid shall be returned without interest or deduction and Seller, Listing Brokerage and Co-operating Brokerage shall not be liable for any costs or damages. Save as to any valid objection so made by such day and except for any objection going to the root of the title, Buyer shall be conclusively deemed to have accepted Seller’s title to the property.