From historical marker:
Governor John Wentworth Mansion
New Hampshire's last Royal Governor, John Wentworth, was never provide with a specially-built exeutive mansion in Portsmouth. Instead he occupied this "Small Hut with little comfortable Apartments" on Pleasant Street, and satisfied his gentlemanly architectural ambitions by constructing an elegant but never-completed estate on the shores of Smith' Pon (now Lake Wentworth) at Wolfeborough, New Hampshire.
This Pleasant Street House was built in 1763 for merchant Henry Appleton. About a year later, Mark Hunking Wentworth, the father of Governor John Wentworth, purchased teh propterty for 4000 pounds. In 1767, the newly-arrived governor took up his residence here, and remained in the house until the outbreak of hostilities in New Hampshire. Diagonally across the road was another parcel of land that belonged to the house, with a stable and coach house in which the governor kept his carriages and the fine horses for which he was famous.
At the time the house was built and for a number of years thereafter, the land adjuscent to it was largely unoccupied by houses. The shores of the mill pond to the south and west were predominately fields and gardens. The land of the Wentworth House itself once extended westward 127 feet to the Pleasant Street Cemetery, and carried this full width 430 feet back to the shores of the pond.
In many respects, John Westworth was the best governor New Hampshire ever had. He divided New Hampshire into counties, sponsored a complete survey and mapping of the province, tried to enforce uniform forestry policies, established Dartmouth College, pressed for internal improvements like the laying out of new roads and construction of Portsmouth's first lighthouse, improved the qualities of horses in the region, and materially aided in the compilation of Belnap's History of New Hampshire.
In June, 1775, however, Wentworth offered hospitality to Co. John Fenton, an up-state royalist who had tried to dissuade the inhabitants of Grafton County from any revolutionary actions. Fenton's presence enraged the Portsmouth mob, who, in the words of the governor's wife, "stove at the House with Clubs, brought a large Cannon and placed it before the Door, and swore to fire through the House." At length, Fenton surrendered for trial, and Wentworth and his family left this house that night, never to return. John Wentworth later became Lieutenant-Governor of Nova Scotia.
During the time that Governor John Wentworth had resided at the house his father had retained ownership of the house until 1770 when he transferred ownership to his daughter Anna and her husband John Fisher. The Fishers retained ownership 1797 when they sold the home to Portsmouth merchant Peter Coffin who lived in the property until 1808. The house was then purchased by Ebenezer Wentworth (son of Governor John's cousin George). Ebenezer Wentworth was a prominent Portsmouth merchant. The house later transfered to Ebenezer's son another prominent merchant. The house remained in the Wentworth family until the 1860s. The house later became a asylum for the cronic invalids. Now it serves as a senior citizens assisted living facility.