"5. THE SURETY in consideration of the demise hereinbefore contained having been made at its request HEREBY COVENANTS with the lessor that the tenant shall pay the rent hereby reserved on the days and in manner aforesaid and shall duly perform and observe all the covenants hereinbefore on the tenant's part contained and that in case of default in such payment of rent or performance or observance of any of the covenants as aforesaid during the currency of the said term and also thereafter during such period as the tenant remains in occupation of the demise premises the surety will pay and make good to the lessor on demand all loss damages costs
"the covenant must either affect land as regards mode of occupation, or it must be such as per se, and not merely from collateral circumstances, affect the value of the land."
"The general principle is, that if the performance of the covenant be beneficial to the reversion, in respect of the lessor's demand, and to no other person, his assignee may sue upon it; but if it be beneficial to the lessor, without regard to his continuing owner of the estate, it is a mere collateral covenant, upon which the assignee cannot sue."
"From these authorities I collect two things. First, that the acid test whether or not a benefit is collateral is that laid down by Best J., namely, is the covenant beneficial to the owner for the time being of the covenantee's land, and to no one else? Secondly, a covenant simply to pay a sum of money, whether by way of insurance premium, compensation or damages, is a covenant capable of touching and concerning the land provided that the existence of the covenant, and the right to payment thereunder, affects the value of the land in whomsoever it is vested for the time being."
"The surety covenant is given as a support or buttress to covenants given by a tenant to a landlord. The covenants by the tenant relate not only to the payment of rent, but also to repair, insurance and user of the premises. All such covenants by a tenant in favour of the landlord touch and concern the land, i.e., the reversion of the landlord. The performance of some covenants by tenants relate to things done on the land itself (e.g. repair and user covenants). Other tenants' covenants (e.g. payment of rent and insurance) require nothing to be done on the land itself. They are mere covenants for the payment of money. The covenant to pay rent is the major cause of the landlord's reversion having any value during the continuance of the term. Where there is privity of estate the tenant's covenant to pay rent touches and concerns the land: Parker v. Webb (1822) 3 Salk. 4. As it seems to me, in principle, a covenant by a third party guaranteeing the performance by the tenant of his obligations should touch and concern the reversion as much as do the tenants' covenants themselves. This view accords with what, to my mind, is the commercial common sense and justice of the case. When, as in the present case, the lease has been assigned on the terms that the sureties will guarantee performance by the assignee of the lease, justice and common sense ought to require the sureties, not the original tenant, to be primarily liable in the event of default by the assignee. So long as the reversion is not assigned, that will be the position. Why should the position between the original tenant and the surety be rendered completely different just because the reversion has been assigned, a transaction wholly outside the control of the original tenant and the sureties?"