Sell the property completely or partial sale with investment?

A professional real estate developer approaches this dispassionately and comes up with unexpected solutions.

Now you’re confusing me again because I wonder how the professional developer manages to get the hot water to the 3rd floor differently than an ordinary person? Whether and how the matter "develops" depends less on any professionals and more on the lack of money, I’m afraid. But I will continue to report, if there is interest.

how the professional developer gets the hot water differently into the 3rd floor,

Caution pun: of course, he just cooks with water too. But he goes through the wall headfirst on the plan. You (know the same wall in real life) of course only go through where there is a door. Simplified, but valid in all details in terms of meaning.

Whether and how the matter "develops" depends less on any professionals than on the lack of money, I'm afraid.

If the g**l is enough focused on profit, he simply brings the necessary capital. "Professional" here has to do with "profitable".

Domestic hot water is insulated and operated with a circulation pump and timer control. You can also have a good debate about what is better/more cost-effective in the long run.

It's about cost reduction. And electrical devices are cheaper when heating 5 liters at a time than heating an entire domestic hot water line just because the kitchen is at the other end.

Regarding the Energy Saving Ordinance, I'm not sure – it wouldn't be a change of use and would have grandfathering protection?

I'm not an expert, but my workplace was supposed to be expanded once. Was it about the ratio of old/new? In any case, everything would have had to be insulated due to the Energy Saving Ordinance... I believe the protection only applies if you renovate a room privately or something like that.

Now you're confusing me again because I wonder how a professional developer gets the hot water to the 3rd floor differently than a regular person?

Katja, I'm not talking about hot water going upstairs but about hot water that is supposed to branch very far from central lines.
A professional plans something like that. The bathrooms are basically central and rather interior. Exterior kitchens are then equipped with devices so that it goes faster. And is cheaper. I don't see any problem there: others heat their houses with electricity.
How is it done in other apartment buildings? You’re not the first to build 4 floors.

With commercial use, you could save quite a bit on fittings compared to what an apartment tenant would expect these days. It starts with underfloor heating. There would be less and simpler sanitary facilities or there are already rooms that could possibly be reused. Regarding the energy saving ordinance, I'm not sure – it wouldn’t be a change of use and would have existing rights? Workrooms are predictably larger. Correspondingly, there would be fewer doors and walls, sockets, switches, paint – whatever a wall usually needs. Fire protection probably differs very little – there are apparently wall suppliers who offer these as "pre-finished fire walls."

So I believe there is a noticeable difference. And yes, the rooms wouldn’t be suitable for Edeka and the like. They already said 15 years ago they wouldn’t want to go in there. It would be more something for internet retailers or maybe a carpenter or artist or who knows.

Okay, so you guys really aren't thinking about developing the property. Just slapping together some cheap commercial space for 16 commercial tenants – no offices or medical practices, but rather simple craftsmen or similar. And on four floors.
Then you could have spared yourself the thread.

Making something out of an opportunity property, in other words doing a project development, is something I understand completely differently. You might be able to draw liquidity from it (for a certain time), but you’re not doing the property any favors.

Ok, so you don’t really intend to develop the property. Just slap together some cheap commercial space for 16 commercial tenants - not offices or practices, but rather simple craftsmen or similar. And that on four floors.

Offices are probably the last thing anyone needs. There are plenty of buildings on various city outskirts sitting as investment ruins. Also in DD. I also don’t understand what you have against craftsmen or artists.

Sorry if you’re disappointed, but first of all we don’t yet know how things will proceed and secondly I’m not the fairy tale lady. We simply lack the money for a castle.

There are loads of buildings like that sitting as investment ruins on various city outskirts.

I just don't want your property to become such an investment ruin due to thoughtless (sustainable) planning. Nothing more, nothing less.

I have nothing against craftsmen or artists. There are plenty of business parks like that in our Ruhr area – old silk weaving mills or similar properties. But none of them are really nice (not just subjectively). And with four floors, that's a whole different ballgame. Craftsmen want the ground floor, while the upper floors are more for artists, recording studios or similar. Rental income is okay relative to the investment, but the operating costs are disproportionately high (percentage-wise, since rent is very low). Therefore, little is invested in these properties, which is a vicious circle.