My land area is about 520 square meters. I want to build a quadrangle. How much will it cost?

It is estimated that 10W is enough to build a quadrangle, but if there is this land, people will generally choose to build a small building, so that there are more rooms and it is cost-effective. It is estimated that it will take about 30W to build a small building. If you can't afford it, you can choose to build the first floor of the infrastructure first, and then use the money to build 2-3 floors. In this case, the foundation+1 floor is about 10- 15W, which is not much different from building a quadrangle.