What is the test for specific performance as a remedy in a contract dispute involving real property?

Historically, it was commonplace for specific performance to be granted as a remedy in the context of contract disputes involving real property. However, the modern approach favours damages, rather than specific performance, as a remedy for breach of contracts involving real property. In Semelhago v. Paramadevan, 1996 CanLII 209 (SCC), [1996] 2 S.C.R. 415 at 429, Sopinka J. noted the exceptional nature of specific performance as a remedy when land is in issue: Specific performance should, therefore, not be granted as a matter of course absent evidence that the property is unique to the extent that its substitute would not be readily available.