and main entryway
Virginia The land on which Colross was first located was originally part of the
Northern Neck Proprietary, a land grant that the exiled
Charles II awarded to seven of his supporters in 1649 during the
English Interregnum. Following the
Restoration in 1660, Charles II finally ascended to the English throne. Charles II renewed the Northern Neck Proprietary grant in 1662, revised it in 1669, and again renewed the original grant favoring original grantee
Thomas Colepeper, 2nd Baron Colepeper and
Henry Bennet, 1st Earl of Arlington in 1672. In 1681, Bennet sold his share to Lord Colepeper, and Lord Colepeper received a new charter for the entire land grant from
James II in 1688. Following the deaths of Lord Colepeper, his wife Margaret, and his daughter Katherine, the Northern Neck Proprietary passed to Katherine's son
Thomas Fairfax, 6th Lord Fairfax of Cameron in 1719. John Potts, a prominent Alexandria merchant, developed the Colross property as a forced-labor cash-crop farm. He began building a brick mansion on the property between 1799 and 1800. Potts encountered financial difficulties and placed the unfinished mansion on the market in 1801. Some sources say Swift's wife reportedly named the estate Belle Air; Swift continued to construct the mansion. Mason used Colross as his chief homestead and made substantial modifications and additions to it. Mason built a high brick wall around the exterior of the Colross property.
Orlando B. Willcox, who later served as a
Union Army general, visited Colross on several occasions around 1851; he described it as a "fine house and ground and the chief residence of the Masons of Alexandria, much frequented by officers of the army". Willcox also remarked on the "hospitality and civility of the head of the house", Pen Mason's mother, Elizabeth "Betsey" Clapham Price (1802–1873). During the
American Civil War, Colross was seized by
Union authorities. Smoot's wife was a member of the Alexander family, and was therefore a descendant of the estate's former owners. While there, the Smoots' daughter Betty wrote, "the grounds included a whole square block and were enclosed with an ancient brick wall ten feet in height". In 1917, another lumber merchant, William Hoge, acquired the mansion. Under similar circumstances to those of nearby
Abingdon, properties surrounding Colross underwent industrialization with the construction of a warehouse complex and ancillary industrial buildings associated with Alexandria Hay & Grain. In Alexandria, the mansion's remaining brick foundation was buried beneath a slab of reinforced concrete for over 50 years. Structures on the site have since included a large 50-truck garage, Andy's Car Wash, a
Dominion Virginia Power substation, and the Hennage Creative Printers facility. == Architecture ==