Do you sign the property contract first? Or sign a supplementary property agreement first?

Sign the property contract first. Supplementary agreements usually conflict with the original property contract. The supplementary agreement is a supplement or change to the original contract, so the property contract should be signed first. The realty service contract refers to the service contract signed between the realty service enterprise and the owners' committee, which stipulates that the realty service enterprise shall carry out professional maintenance, conservation, management and maintenance of the environmental sanitation and public order in the relevant areas, and the owners shall pay remuneration.