If the Commission considers that all or part of any private land should be made available for use as a walkway, it may negotiate an agreement with the landholder for—
(a) an easement or lease over all or that part of the land (as the case may be) for use as a walkway; or
(b) the purchase of any land that includes all or that part of the land (as the case may be) proposed for use as a walkway.