Is a 2 Z15 loan possible for an additional real estate purchase?

Hello,
Four years ago we bought an apartment with a Z15 loan, which is now becoming too small due to further family growth. We would like to keep the existing apartment and rent it out and buy something bigger. Is it possible to get another "new" Z15 loan even though the old one has not yet expired and is still being paid off? Does anyone have experience with this?
Thank you very much!

We would like to keep and rent out the existing apartment and buy something bigger.

First of all, the question whether you already have adequate living space – family with three children requires 100sqm (two kids = 90sqm). This is stated in the conditions. Then the loan is tied to owner-occupation until the end of the fixed interest period. So you may not use the old loan for a rented apartment. This is also stated in the conditions. Therefore, it is probably only a pledge swap, if possible. Or repayment with a prepayment penalty and reapplication. Then you need a bank for the apartment to be rented out. Sorry, but your plan is currently falling apart completely.

As far as I know, you are not allowed to own residential property if you want to apply for Z15.

Thank you very much for your answers! I should have added this: our apartment is only 72sqm, so it is considered inappropriate. Under the conditions, I only found that you are not allowed to own a home that is appropriate. That’s why we came up with the idea...

would not start with that otherwise they will terminate your old one

Best to just ask the bank "as a dummy"

4.4 Commitment The subsidized housing is bound to owner-occupation for a period of 15 years after occupancy, but at the latest until the end of the interest subsidy.

I don’t know exactly what happens in case of moving out or renting out, but I would assume that your Z15 would be terminated and you would have to refinance at current conditions. But just call the hotline for the Z15 financing. They can quickly tell you the usual procedure. How about selling as an alternative?