Modernisation measures are building alterations
1. by means of which final energy is saved with lasting effect in relation to the leased property (energy efficiency modernisation),
2. by means of which non-renewable primary energy is saved with lasting effect or the climate is protected with lasting effect, unless energy efficiency modernisation has already been carried out in accordance with no. 1,
3. by means of which water consumption is reduced with lasting effect,
4. by means of which the utility value of the leased property is increased with lasting effect,
4a. by means of which the leased property is connected, for the first time, by an optical fibre cable, to a public network with a very high capacity as defined in section 3 no. 33 of the Telecommunications Act (Telekommunikationsgesetz),
5. by means of which the general living conditions are permanently improved,
6. which are carried out due to circumstances for which the lessor is not responsible, and which do not constitute structural maintenance measures in accordance with section 555a, or
7. by means of which new residential space is created.