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=S=> BGB 559. 1 If the lessor has carried out construction measures that increase the utility value of the leased property with lasting effect , improve general living conditions permanently or lead to savings of energy or water with lasting effect ( modernisation ) , or if he has carried out other construction measures due to circumstances for which he is not responsible , then he may increase the annual rent by 11 per cent of the costs spent on the dwelling .
=S=> BGB 559. 2 If the construction measures have been carried out for more than one dwelling , then the costs must be apportioned reasonably among the individual dwellings .
=S=> BGB 559. 3 A deviating agreement to the disadvantage of the lessee is ineffective .
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