Floor plan single-family house, 1.5 floors, 2 children's rooms, 2 offices - is area usage optimal?

What are BZH and mbH?

Reference height? And mbH probably something like average_b_height ;)

Slope: East-West: 1.20m; North-South: 1.5m

Such a precise description is rare to find.

Are there no actual elevation data from the surveyor?

Dimensions of the property are also quite nice.

Reference height? And mbH probably something like mittlere_b_Höhe ;)

BZH: reference height and mbH: with limited height

Such a precise description is rare. Are there no real height measurements from the surveyor? Dimensions of the plot are also quite nice.

We are still waiting for the surveyor. The plot is about 22m (east-west) and 30m (north-south).

BZH: reference height and mbH: with limited height

... and I'm no wiser than before: is there ever a reference height (usually in meters above sea level) specified for each property?; "limited heights" are regularly TH and FH, as long as they are specified (the maximum is exactly what is possibly specified).

... and am as clever as before: is a reference height (usually in meters above sea level) given per property?; "restricted heights" are TH and FH regularly, if they are specified (the maximum is exactly what is possibly specified).

Yes, the reference height is given per property. In this case at 663.25m above sea level (+/-0.25m)