(1) Where J landlord has al any time, before the ummifji'''mmr nf this Act with or without the appiov.il of the lenanti oi after the commencement of this Act with the wutten appun.il 'if the tii?n.ml incurred p^ne^(^- ture for any improvement, addition oi • tructuial aliuvitioii in the p1 misfs not being expenditure on decoration oi tL"^nl i!1!̂ ' "p.t'is necessity o' iisual for such premises, and tfie cost of thH linpiiivemfnt, addition or altci.ilimi has not lx;on t,itcn into aaount in dcleipiiniiu* fh^ lent of tin- pieniises tihe landloid may lawfully inne.ve the rent pi'i ycu by .m anu"int not execediuj;
ten pei tent, of .such cost.
(?) Where, after tlic rent of a picTinses has bf*m fixed under this Ai f <r agreed upon, as tbc case may be, there has been ,i decjease, diminution or deterioration of accommodation in such premises, the lemnt may claim a reilwtmn in the rent.