Why does the tenant require warranties?

Defects which arise following completion are a fairly common feature of construction projects. Many defects arise during the defects liability period and the contractor will generally be obliged to rectify them in accordance with the building contract (see Practice Note: Defects liability period and rectification of defects). However, other defects (which may be more serious) can often manifest themselves later on, ie when the contractor is no longer contractually obliged under the building contract to return to site to correct them, and after the landlord/developer's liability to the tenant under the agreement for lease for