As instances of " collateral " covenants, we may take a covenant by a lessor to give the lessee a right of pre-emption over a piece of land adjoining the subject of the demise, or in the case of a lease of a beer-shop, not to keep any similar shop within a prescribed distance from the premises demised, or a covenant by a lessee to pay rates on premises not demised.
Should he desire to sell his estates, the right of pre-emption belonged to the tenants, or, in default, to the neighbours.
Congress therefore reduced the price of land from $2 to $1.25 per acre, and adopted the policy of pre-emption, preference being given to the claims of existing settlers.
Should the tenant sell or exchange his interest in the property, the right of pre-emption is vested in the landlord, and a corresponding right is enjoyed by the tenant should the quitrent be for sale.
Spain has given to France the right of pre-emption over any of her West African colonies.