Xiao Lou bought a commercial house from a real estate development company. When did Xiao Lou get this house?

From the date of purchase. According to the data of Property Law, after the establishment, alteration, transfer and elimination of the real estate right, Xiao Lou purchased the commercial house from the real estate development company according to law, and Xiao Lou obtained the ownership of the house from the date of purchase. When the commercial house sales contract came into effect, the developer transferred the ownership of the house to Xiao Lou.