The real estate market and the construction industry have become complex. The binary builder-buyer relationship disappeared. What exists now, in projects of all scale, are true “negotiation systems” (Cataño BerrÃo, 2022) that involve, on the one hand, various subjects (the owner of the lot, the developer, the builder, the financier, the company fiduciary, as well as the buyer/consumer, beneficiary of the area) and, on the other, several concurrent contractual and non-contractual legal transactions united by a common purpose.