PALADIN?. An UPREIT exists as another exit strategy. An UPREIT or 721 exchange are both terms used to describe a 1031 exchange into a REIT. When this happens, an investor's interest in the DST is converted into REIT shares, which is when the 721 exchange occurs. The REIT already controls the DST. After some time, the REIT will purchase shares owned by the DST. The DST may then dissolve.