/kloc-What do you mean by 0/20% buying back the property?

Generally, the units selling houses buy back from the owners at 120% of the original house (property) purchase price.

In the (house) property right sales contract, the repurchase agreement should also be agreed.

Some terms, such as the structure of the house cannot be changed, the use is also limited, and the property rights cannot be changed.

It is best to agree on the expenses arising from the repurchase.

I hope to give you a reference.