79. Burden of covenant.

Except in cases arising between landlord and tenant, the burden of a covenant relating to the use or enjoyment of land does not run with the land at law1. Where the covenant is positive in substance, and can only be complied with by the expenditure of money, the burden does not run with the land in equity2. The covenantee may validly reserve a right of re-entry exercisable on failure by the original covenantor or his successors to observe the covenant. Such a right of re-entry creates an equitable interest which is not registrable as a land charge affecting unregistered