Agreeing to undertake the financial arrangements Dulany bought the option, then the tract itself, selling small lots to the enterprising Germans.

Following the death of his wife, Governor Johnson spent the last 25 years of his life living as a guest of his daughter Ann at Rose Hill.

Thought to have been built by local craftsman the Rose Hill manor house construction began shortly after the wedding of Ann Jennings Johnson and Major John Colin Graham.

[2] Rose Hill Mansion is approached by a driveway off an entrance road adjoining the northern boundary of Governor Thomas Johnson High School from the west side of North Market Street.

[2] Off the east side of the entrance hall is a 26-foot square, high ceiling drawing room containing six windows, a mantel piece and a large chandelier with crystal prisms.

[2] The second floor center hall south door opens directly onto the upper level of the front porch that faces the high school.

[2] A kitchen with a fireplace and beehive oven is adjoined to the western side of the mansion with a flush brick chimney rising from the west gable end.

It is lighted by nine-over-six sash pane round arched dormer windows headed by local style stepped gables on the front and rear.

[2] A formal, native fieldstone walled garden and orchard with old trees occupies about a half an acre on the northern side of the mansion.

The garden is accented by an attractive, two-tier cast iron fountain with the pedestal and bowls decorated by Greek acanthus leaves.

In a child-friendly, hands-on environment the museums present the daily life of Thomas Johnson, Maryland's first governor, and the individuals who lived on the property as well as the history of agriculture and transportation in Frederick County (Updated 1 Feb 2014 by Frederick Chapter National Society Daughters of the American Revolution Historic Preservation Committee) 3.