You can take pictures of any buildings if you are in a public place, and can freely use such photographs without consent of a owner or designer of that building. (law.stackexchange.com)
Photographs of property that are posted on a real estate broker's website shall not be used or reproduced without written permission from the copyright holder of such photographs. (govt.westlaw.com)
A panel of three Ontario Divisional Court Judges have held that residential landlords are not permitted to photograph a property while it is occupied by a tenant unless the lease explicitly permits such photographs to be taken, or the landlord obtains the express consent of the tenant. (slaw.ca)