Dylan Costello built his career at the intersection of real estate and development — a space where most agents won't go because it requires understanding not just the market, but the entire lifecycle of a project.
As co-founder of The Avenue at SERHANT., Dylan specializes in new residential development across Greater Boston: sourcing development opportunities for builders, advising on product positioning and pricing strategy, and executing full sellouts from contract through closing.
What separates Dylan from conventional agents is his operational knowledge. He understands permitting, zoning, construction quality, capital stacks, and the economics of a developer's pro forma. That fluency translates directly into better outcomes for his clients — whether he's advising a developer on unit mix and pricing, negotiating a complex deal structure, or identifying buyers before they're actively searching.
In 2025, Dylan and his team closed 109 transactions and $90M+ in volume. He leads a team of six agents and operations staff, with current focus on the Boston, South Shore, MetroWest, and North Shore markets.
Dylan grew up in Boston and later attended the National University of Ireland, Galway, where he earned a Bachelor in Commerce with a focus on Marketing and HR. That background — analytical, relationship-driven, globally minded — shapes how he approaches every client engagement.
He is a SERHANT. Boston Founding Agent, joining the firm at its 2026 Boston launch as part of a select group of founding agents chosen for their track record and market expertise.
Dylan lives in Boston with his wife, three children and dog.
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