19. Lettings for an unlawful purpose.

Where at a time of a letting the premises are to the landlord's knowledge intended to be used for an illegal purpose, the lease is wholly unenforceable and the landlord may not recover the rent or sue upon the tenant's covenants1. Formerly it was held that the same results followed where the known intended use was to be immoral, as opposed to illegal, but it is now doubtful whether this is so or, alternatively, what conduct would be held to be sufficiently immoral for the lease to be rendered unenforceable2. Where, by reason of illegality or immorality, a lease