Hello and thank you again for your support! According to a statement from an employee of the city planning office, the data was taken from another area in the development plan. In that area, only semi-detached/townhouses were built about 20 years ago, where these unusual floor area ratios could be met. In the current new development area, where only single-family houses are being built, the situation is different. The employee was already aware of the problem. On the second page of the building application, I am supposed to apply for the removal of the floor area ratio, which the building supervisory authority will probably approve without any problems.