It really depends on what is written in any contracts. In our development area, there is indeed a building obligation, but in reality, nobody cares about that. After 4 years, we were finally able to buy a plot, one is now being sold after 5 years without the previous owner being pressured, and four plots still belong to some farmers, one of whom literally said: "My grandson is supposed to build there." The grandson had just been born...
In other words, there is a building obligation, but it is not penalized. Apart from writing angry letters, they can't do anything.
However, the city has learned from this; in another development area, they explicitly stipulated that they have a repurchase right after 3 years (at a very, very cheap price!). So you'd better hurry up with building there...
So; if a penalized building obligation or even a repurchase right is recorded in the land register or development plan, I would be cautious with that. Otherwise: buy and leave it alone!
But be aware of some disadvantages:
· In new development areas, you don't exactly make yourself popular because the streets, etc. are often only completed after the last construction measure. That means as long as you don't build, your future neighbors might have to live with a bumpy road, puddles everywhere, etc.
· A free plot is very often used as an interim/final storage site for excavated soil, machines, and materials. On our plot, the previous owner unfortunately allowed this. Result: I still have 100-200 sqm of extra debris on the plot that just happened to be left there. And because of the wheel loaders, the topsoil is so churned up that I have to throw away the entire topsoil layer. That will cost me several thousand extra...
· If you own a plot, you have a traffic safety obligation, which means you have to clear snow, ensure that weeds don’t grow onto the street, etc.
Best regards,
Andreas