With limited supply, low vacancy rates and far less upkeep than traditional warehouses, industrial outdoor storage is an asset class that's go for liftoff.

Nashville follows closely behind, with 4.6 million square feet of new office space under construction.

More than 70% of US industrial space was built before the 21st century.

Jon Reno, Mark Vanis and Trevor Gale join the firm as managing directors and will specialize in representing institutional owners and occupiers.