450. Burden of tenant's covenants: in general.

Whether the burden of a covenant by the tenant runs with the land depends partly upon the nature, and partly upon the form, of the covenant. As regards its nature, the covenant may concern the land itself or something already in existence on the land, in either of which cases it is described in the leading authority establishing the rules set out in heads (a) to (c) below as concerning 'a thing in being' (that is, something which is in existence at the date of the lease); or, although directly relating to the land, it may concern something only