Early history The company was founded by Gordon Burnam (1931-2017) who had founded Storage Trust, which became a
public company in 1994 and was acquired by
Public Storage for $600 million in 1999.
Expansion In March 2005, the company purchased five properties in Texas. By May 2005, the company had facilities in 11 states. In 2007, the company expanded into Canada, and had 70 properties comprising 5 million square feet. In 2011 and 2012, 640,000 square feet of solar collectors was installed on the roofs of storage locations in Toronto, providing 3 megawatts of power. In 2009, TKG-StorageMart Canada acquired InStorage for about $416 million. This increased the number of storage facilities to 120, making it one of the largest privately owned storage companies in North America and the largest in Canada. As of 2013, the firm had 132 storage facility locations in the US and Canada. In 2014, it purchased 31 additional facilities. By 2016 the company had 172 locations. In 2016, StorageMart acquired Big Box Storage Centres for £100 million. It owned 15 locations in southeastern England comprising 674,756 square feet in 9,655 units. StorageMart acquired
Manhattan Mini Storage in 2021, making it the largest private self storage REIT worldwide. ==In popular media==