Marina Bay Properties, LLC

One broker, one neighborhood. Marina Bay Properties is Colleen A. Brennan-Russo's own firm, and it works a single stretch of the Quincy waterfront — representing buyers, sellers and renters of Marina Bay condominiums and townhomes rather than chasing listings across the South Shore. Her Massachusetts real estate broker license, 9922-RE-LC, is active. The firm says she moved to Marina Bay in 1989, began representing clients there in 1993, and counts 33 years in the business; it also lists Massachusetts and National Association of Realtors membership. Those last details are the company's own statements, not registry findings. The public side is thin. Two Google ratings, both from 2024, both 5 stars. Two ratings pointing the same direction is a fair start, but it is not enough to show how she handles a listing that stalls or a deal that turns late. That narrow focus cuts both ways. A broker who has sold inside one condo community for decades tends to know the buildings, the fees and the comps better than a generalist does — and that same specialization makes her the wrong fit for a search ranging across several towns. Worth asking before you sign anything: her recent Marina Bay closings, with list price against final sale price and days on market, plus two or three client references from the past year.