Basic floor area ratio / floor area ratio for plots without a development plan: How to calculate? Experiences?

Good evening everyone,

Although I have already read up on some knowledge, I am stuck at a certain point. Consequently, I hope that someone here can help me.

For retirement provision, I want to buy a plot of land and build a multi-family house on it. I would then like to rent these apartments at socially acceptable rates. Now, the seller has asked me to make an offer for the land. I would like to make this offer, but I am not quite sure how to calculate everything.

Information about the plot:
- 623m²
- Location: Berlin
- no development plan established
- land use plan - residential area, W2
- standard land value 800m²/ W 1.0

Because there is no development plan, I do not know the dimensions of the structural use (site coverage ratio & floor area ratio). Consequently, I do not know how I could develop the plot. The land use plan does not help me either because the specifications for site coverage ratio and floor area ratio vary greatly in this type of area.

Where and how can I get this information in order to calculate and be able to make an offer to the seller? There must be some way to know with almost certainty how I can develop a plot without having to buy it first and having a development plan drawn up...

Thank you very much and I really hope that someone can help me.

Have a nice evening and best regards,

K. Schulz

Building authority. Call.

I would like to rent these apartments out at socially acceptable rates afterwards.

Don't think anyone will thank you for that. I hope you are not using most of your retirement savings for it, you could end up badly hurt.

Thank you @ Nordlys,

and the information from the building authority remains the same, no matter which caseworker I have on the phone?
+ What are the experts from the building authority referring to? Is there any map here that is not accessible to the public?

Thanks also to @ Alex 85 for the hint.

Regards,

K. Schulz

If you want it to be binding, then a [Bauvoranfrage] helps. The office is later bound to it. However, it takes a few days.

I am reading very speculatively from the description that the neighboring plots are still undeveloped, so an infill development according to §34 would fail due to the lack of an orientation environment. And it is land for which the district has not yet concretely planned to draw up a development plan and which is still in the waiting loop. For a "project-related development plan," your individual plot is too small; this is only done from about four times the area.

Zur Altersvorsorge möchte ich ein Grundstück erwerben und darauf ein Mehrfamilienhaus bauen.
Diese Wohnungen möchte ich anschließend Sozialverträglich vermieten.

Becoming a landlord becomes complex above three units and remains uneconomical below ten units, certainly in a big city.

Renting in a socially responsible manner has three drawbacks: 1) property taxes, fees for surface water drainage – both also apply to vacancies! – etc. do not decrease because of it; 2) on the "other hand," building with subsidies is involved, which is a science in itself; 3) with only low-income tenants, the building deteriorates. Social housing companies nowadays pay attention to the tenant mix, which requires a large stock.