Prayer: Obtaining Consent to Pray on Another's Property
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 864
Performing prayers on someone else’s property is permitted only when the owner clearly gives his consent to do so, or he says something that indicates he has given permission – such as giving someone his consent to sit and sleep on his property, by which it can be understood that he has given permission for prayers to be performed there as well – or when one derives confidence by some other way that the owner consents.