A data processing method and system of selling tenant-in-common interests as non-security investments by a real estate sponsor is disclosed. A real estate property is purchased at a purchase price. An investment price of a tenant-in-common interest in the real estate property is calculated by a computer system utilizing the purchase price and a sponsoring fee. The real estate sponsor then solicits at least one offer to purchase a tenant-in-common interest in the real estate property at least through a computer network. At least one offer to purchase a tenant-in-common interest in the real estate property is received by the real estate sponsor. The real estate sponsor then accepts an offer to purchase a tenant-in-common interest from at least one investor. All control on the real estate property is divested from the real estate sponsor. Thus, day-to-day property management is yielded to a third party, such that the real estate sponsor relinquishes all right to exercise property management control, the third party being elected by the at least one investor. The real estate sponsor and the at least one investor close the sale of the real estate property.