Tanger Factory Outlet Centers, Inc. and subsidiaries, which we refer to as the Company, is one of the largest owners and operators of outlet centers in the United States and Canada. We are a fully-integrated, self-administered and self-managed REIT, which focuses exclusively on developing, acquiring, owning, operating and managing outlet shopping centers. As of December 31, 2018, our consolidated portfolio consisted of 36 outlet centers, with a total gross leasable area of approximately 12.9 million square feet, which were 97% occupied and contained over 2,600 stores representing approximately 400 store brands. We also had partial ownership interests in 8 unconsolidated outlet centers totaling approximately 2.4 million square feet, including 4 outlet centers in Canada.
Our outlet centers and other assets are held by, and all of our operations are conducted by, Tanger Properties Limited Partnership and subsidiaries, which we refer to as the Operating Partnership. The Company owns the majority of the units of partnership interest issued by the Operating Partnership through its two wholly-owned subsidiaries, Tanger GP Trust and Tanger LP Trust. Tanger GP Trust controls the Operating Partnership as its sole general partner. Tanger LP Trust holds a limited partnership interest.
As of December 31, 2018, the Company, through its ownership of the Tanger GP Trust and Tanger LP Trust, owned 93,941,783 units of the Operating Partnership and the Non-Company LPs collectively owned 4,960,684 Class A common limited partnership units. Each Class A common limited partnership unit held by the Non-Company LPs is exchangeable for one of the Company's common shares, subject to certain limitations to preserve the Company's status as a REIT. Class B common limited partnership units, which are held by Tanger LP Trust, are not exchangeable for common shares of the Company.