Civil Code § 3387
ARTICLE 3. Specific Performance of Obligations [[3384.] - 3395.]
It is to be presumed that the breach of an agreement to transfer real property cannot be adequately relieved by pecuniary compensation. In the case of a single-family dwelling which the party seeking performance intends to occupy, this presumption is conclusive. In all other cases, this presumption is a presumption affecting the burden of proof.