Gibraltar (previously known as the Hugh Rodney Sharp Mansion), located at 2505 Pennsylvania Avenue in Wilmington, Delaware, is a country estate home dating from c. 1844 that is listed on the National Register of Historic Places.

Sharp expanded and remodeled the house, as well as commissioning the pioneering female landscape designer Marian Cruger Coffin to lay out the gardens.

Brincklé was said to have built it in an unsuccessful attempt to woo a woman from Philadelphia and subsequently used it as a retreat and as a base where he could carry out horticultural experiments and entertain friends and relatives.

[2] The house's interior decor includes Colonial Revival and Italianate architecture and contains works by Albert Ely Ives and others.

The estate was put up for sale after his death and was saved from demolition after a campaign by local people and the Preservation Delaware organization.

[7] After Preservation Delaware acquired the estate, a conversion easement was placed on the property with the intention of refurbishing it as a 31-room hotel.

An Exeter, New Hampshire company called Someplace(s) Different which operates historic hotels in the US and Canada signed an agreement to handle the conversion.

A few years later another company, CCS Investors of Yorklyn, Delaware, proposed to convert the mansion into commercial office space.

On July 16, 2009, the court ruled in favor of the developer's request to change the estate's zoning status from residential to commercial.

The mansion sits on an elevation which slopes gently down to the west but drops sharply away to the east, overlooking the gardens.

[2] The core of the irregularly-shaped mansion is a three-story building facing east – the original Italianate house erected by Brincklé – with several wings added by the Sharps in the early 20th century.

More alterations were made to the north elevation by Wilmington architect Albert Ely Ives, who oversaw the addition of a two- and three-story service wing with a one-story porch.

[5] Hugh Rodney Sharp was related by marriage to Henry Francis du Pont, who was a long-standing friend of Coffin and may have recommended her for the task of creating the garden at Gibraltar.

Numerous architectural and decorative elements such as fountains, statues, urns and hand-forged iron gates provide additional ornamentation.

From the Flower Garden, a 200 feet (61 m) long avenue of Bald Cypresses (planted between 1921 and 1925) leads to a large fountain and a teahouse that the Sharps used for lunches and to entertain guests.