For $1.75 million, this mansion on the Delaware has a genuine George Washington connection

Savoring the sunset from the rotunda porch is one of the fond memories Diane and Sam Allen share about 445 Cottage Ave. in Edgewater Park, N.J.

The grand Delaware River house is where they lived for 43 years while raising their two children, pursuing careers in politics (hers) as well as industry (his), and enjoying life on the water with family and friends.

Known as Towerview, the three-story, seven-bedroom home with 6½ bathrooms and 7,012 square feet of living space — on three woodsy acres with rare trees, a swimming pool, and a tennis court — is for sale.

The house has early 18th-century roots, a genuine George Washington connection, and a rich, more recent history as the setting for philanthropic, civic, social, and family events.

The asking price is $1.75 million.

“Prospects come in the door with their eyes widening … and they are completely overwhelmed by the home,” said Lauren Soss an agent with Compass RE.

The grand staircase, stencil moldings, spacious rooms, stained glass, abundant light, and other design and decorative elements have been “meticulously” maintained by the Allens, said Naoji Moriuchi, a Compass associate broker and friend.

“This home has been a love story for Diane and Sam and the entire family,” he said.

Accounts provided by the Allens and Compass describe the mansion as having evolved from a single-room farmhouse in the mid-1700s. Later enlarged, it became the home of Elias Boudinot, the president of the Continental Congress during the Revolutionary War.

Boudinot was later named director of the U.S. Mint by President George Washington.

A lifelong gardener and retired New Jersey Republican legislator, Diane Allen enjoyed hosting fundraisers for the Pennsylvania Horticultural Society as well as events for political causes and candidates. “Including me, on occasion,” she said.

“We could have 200 people inside in the middle of winter and not feel crowded,” said Allen, who also had a successful career as a television journalist. “There’s plenty of elbow room in here.”

Sam is descended from a family that he said “came here a year before William Penn.” His great-grandfather, Samuel Leeds Allen, invented the Flexible Flyer sled.

One of the things he misses about Towerview is the relationship the house has with the river.

“It’s ever-changing,” Sam said. “The tide changes twice a day … and when there’s a big ship passing on the river the propeller creates a vibration you can feel.”

“It was a wonderful home, but I am absolutely ready for someone to be the next steward of it,” Diane Allen said. “I would hope the buyer will feel that the historical value of this house is such they will shepherd it through the coming decades.”