DALLAS — The Cantrell Co. has sold the 606-unit Spring Hill Apartments in north Dallas. Spring Hill Investors LP of Dallas purchased the property located at 13750 Maham Road. HS Spring Hill LLC of California was the seller. The complex is a Class C property with below-market rents for the north Dallas submarket. Units average 789 square feet. The 72-building complex was built between 1969 and 1978 on 25.6 acres.