Moin and [USER=54768]@hanghaus2000],
700 sqm with a floor area ratio of 0.5 is almost 350 sqm minus any outdoor facilities and consideration of sealed surfaces, floor area ratio 1 and 2, you might have to come down to about 250 sqm of living space, you should work with external stairs.
I cannot estimate the dimensions of the plot from the plan – but external stairs must also comply with clearance areas. In addition, there are safety regulations regarding width, slip resistance, material, so you don’t really save space because you have to add the space for the stairs outside.
Actually, it's not about the economic viability or how big the house can be, but only whether it is legally allowed to realize 4WE or 5WE per plot there. Can someone please help me there?
That will probably fail due to the floor area ratio, won't it? It is 0.25. And if then one parking space per residential unit is also required, in my opinion it will be very tight.