Can I buy and sell parking spaces on the ground in the community? Or can I rent it for 70 years?

To tell the truth, both parties who signed this Sales Contract for Ground Parking Spaces lack legal awareness and understanding.

Closed garage (that is, a permanent building surrounded by walls, whether built underground or on the ground) needs to be approved by planning in advance and registered as a saleable building through real estate registration. Only the parking spaces in this garage can be sold and have property rights. Owners have to pay management fees after buying, because the property needs to invest manpower and material resources to manage and maintain, but also consumes energy.

Other open parking spaces (such as those formed by marking the ground somewhere in the community) are not allowed to be bought or sold. Because it belongs to the public parts or facilities of the community, the land use right belongs to all owners of the community. Whoever uses it pays (parking fee), part of the management fee charged by the property is deducted, and the rest is included in the community maintenance fund account as public income. It is equivalent to compensation for other owners who do not use this facility.

Knowing this truth, you should understand that this contract is illegal and invalid and should be terminated. Developers really don't understand persistence, so sue.