Sell the property completely or partial sale with investment?

I don't believe that he intended to build the same thing 75 times. I rather suspect that he only made a cost estimate. The demand for housing is supposed to be quite high in DD anyway.

The demand for housing is supposed to be quite high in DD anyway.

That’s exactly where the rub is. The typical investor mentality is this: they look at size categories to see how the supply-demand ratio is for, for example, 45 / 60 / 75 / 90 sqm apartments on site; and accordingly try to divide the property area. Or they aim for certain sales price target sizes that fit the "budget" of potential buyers. What both approaches have in common is that they don’t have to align with what is best for the property owner. The typical investor wants to "sell out" the finished unit quickly. They don’t care who moves in. But you – because you, for example, want to keep the ground floor retail space – do care who lives above.

Well, if we actually complete this 75-unit housing project, it will be quite a separate complex. We won’t be messing around with it. It’s just for living. The property would basically be divided; on the remaining piece we’ll still keep a "bit" of business.

Therefore, it could be optimized according to demand. That we are not aiming for social housing there now is probably understood by everyone. Students are also no longer considered – they probably wouldn’t want to live there anyway. But before we worry about that... we are still far from that.

Question: For a possible conversion into a residential building, the existing building must meet the highest fire protection standards. For this purpose, the building requires (among other things) a fire wall as an exterior wall. Now I have read that such a wall only needs to be made of non-combustible materials. These are materials of building material class A, such as bricks. The exterior walls of the building consist of 65 cm thick brick walls. Can I therefore assume that all exterior walls meet the standard for fire walls?

The exterior walls of the building consist of 65cm thick brick walls. Can I therefore assume that all the exterior walls meet the standard for firewalls?

Basically, yes. In terms of wall thickness, this is certainly more than fulfilled here, but even with walls kilometers thick, you can't just casually make a big hole to run a pipe through. A fire is basically a blower door test with flames.

Do you mean there must be no windows in the wall? Or are those then "fire protection windows"?