[Notes to question 3]
a) Finished earth- or lower level floors as well as other floors even if they are not serving living needs are to be counted. The "Estrich" [type of large entrance hall] is to be counted when it is finished at least half for living purposes.

c) To be included are rooms which are available on an interim basis as air raid shelters.

e) By sewer is meant the sewer network provided by the municipality as well as a privately operated sewer system [e.g. septic tank]. A cesspool without overflow into pipes is not a sewer as defined here.