In the case of resumption by a landlord, or in the case of an existing yearly tenant or a qualified leaseholder or statutory small tenant becoming a landholder, the rights of parties interested, so far as affected by the operation of this Act, as the date of resumption or date when such tenant or leaseholder becomes a landholder, as the case may be, shall, in the event of dispute, be adjusted by order of the Land Court, which order they are hereby empowered to pronounce on the application of any party interested.