In determining the amount of such net addition as aforesaid, regard shall be had to the purposes for which it is intended that the premises shall be used after the termination of the tenancy, and if it is shown that it is intended to demolish or to make structural alterations in the premises or any part thereof or to use the premises for a different purpose, regard shall be had to the effect of such demolition, alteration or change of user on the additional value attributable to the improvement, and to the length of time likely to elapse between the termination of the tenancy and the demolition, alteration or change of user.
In the absence of agreement between the parties, all questions as to the right to compensation under this section, or as to the amount thereof, shall be determined by the tribunal hereinafter mentioned, and if the tribunal determines that, on account of the intention to demolish or alter or to change the user of the premises, no compensation or a reduced amount of compensation shall be paid, the tribunal may authorise a further application for compensation to be made by the tenant if effect is not given to the intention within such time as may be fixed by the tribunal.