Winthrop Crossing is located in the heart of Aspinwall Hill, ideally located, between Route 9 and Beacon Street . A single-family residence, built in the late 19th century, originally occupied the site. When, at some point, the building was converted into a nursing home, all of the building's original interior and exterior detail was removed. Rosemont developed a plan to demolish the original structure and build two new buildings on the site.

To address concerns of the neighborhood, Rosemont agreed to work with a design review committee created by the Preservation Commission. The buildings that emerged from this process employ traditional details and materials evocative of the original structure on the site and blend seamlessly into the neighborhood.

Four new townhouse residences are located in two new buildings.

Each residence contains a living room/dining room, eat-in kitchen, family room and powder room on the main level. The upper level has a master suite and three additional bedrooms. Each unit contains approximately 3,000 square feet. These residences were built to exacting standards of elegance and aesthetics, and feature materials that befit this project's unique location and style. The exterior materials consist of Weymouth seam faced granite, clapboard and shingles. The entry is a custom made mahogany door with wood sidelights and a glass transom.

This project was completed in 2003.