Section 1031(f) provides that if a Taxpayer exchanges with a related party then the party who acquired the property in the exchange must hold it for 2 years or the exchange will be disallowed.
Lack of Liquidity- Exchanging properties continually can tie up funds in real estate, making it hard for an investor to access liquid capital if required. While real estate can be a profitable investment, it's not as liquid as some other assets.