Boston, MA office market
Office space in Seaport / Innovation District.
The Seaport (officially the Innovation District) covers the South Boston waterfront from Fort Point Channel east to roughly the Seaport World Trade Center. Inventory is ~22 million square feet, almost entirely delivered in the 2010–2024 redevelopment cycle. Class A asking rents run $55–$80/SF; trophy waterfront product (Vertex HQ at 11 Fan Pier, 121 Seaport, 100 Northern) trades at $75–$100/SF. Availability is in the high teens — elevated for Boston but lower than national CBD averages.
The Seaport is the youngest major-city office submarket in the country — effectively zero office inventory in 2010, 22M SF in 2025. The build-out came in waves: Vertex's HQ (the first major anchor, 2014), GE's HQ (2016, since downsized), and a steady cadence of speculative Class A development by Boston Properties, WS Development, and others. The result is overwhelmingly modern Class A stock with large floor plates (40,000–80,000 SF) suited to scaling tech and life-sciences tenants.
Tenant mix has been more diverse than the Back Bay's. Life sciences (Vertex, Foundation Medicine, Goodwin Procter), tech (Klaviyo, PTC, Wayfair pre-downsizing), and finance (State Street, Putnam, edge financial services). Notable absences: the old-line Big Law and consulting firms that anchor Back Bay haven't migrated to the Seaport in volume — they remain on Boylston Street.
The submarket's strategic positioning vs. Back Bay is clear: Seaport wins on building quality, floor plate, and (post-2020) waterfront amenity. Back Bay wins on density, amenity stack, transit (Back Bay station is on the Orange Line and Amtrak), and the established prestige that 30+ years of trophy office cultivates. For 30,000+ SF tenants needing modern infrastructure, Seaport. For 5,000–20,000 SF tenants prioritizing established neighborhood feel, Back Bay.
Market snapshot
By the numbers
- Inventory
- ~22M SF
- Class A asking rent
- $55–$80/SF
- Trophy waterfront rent
- $75–$100/SF
- Availability rate
- 17–20%
- Typical free rent
- 10–16 months on 7–10yr lease
- Typical TI allowance
- $100–$160/SF
Deals tracked
-
Avg rent
-/SF
Avg TI
-/SF
Median deal
-K SF
Notable buildings
- 11 Fan Pier (Vertex HQ)
- 121 Seaport
- 100 Northern Avenue
- Pier 4
- One Seaport Square
Broker perspective
The Seaport is the right answer for Boston tenants who need scale (30,000+ SF) and modern building infrastructure. The pricing is competitive vs. Back Bay on a same-size basis — you'll often pay $5–$15/SF less for comparable Class A square footage in the Seaport, with newer mechanicals. The narrative that Back Bay is more expensive than Seaport isn't right for trophy product; it's the same range with different building styles.
Frequently asked
People also ask
Should I lease in the Seaport or Back Bay?
Size-driven. Under 15,000 SF and Back Bay usually wins (denser amenity, more options, established prestige). Over 30,000 SF and Seaport often wins (newer Class A, larger floor plates, comparable rents). Between those, evaluate based on tenant mix — life sciences and consumer tech often prefer Seaport; law and consulting prefer Back Bay.
Is the Seaport really cheaper than Back Bay?
Slightly on Class A trophy. Seaport averages $55–$80/SF vs. Back Bay's $65–$90/SF. The difference closes at the trophy waterfront tier. Don't expect dramatic cost savings; expect comparable pricing with different building styles.
What's the commute to the Seaport?
Improving but still the weak point. The Silver Line BRT serves the Seaport from South Station; the new water taxi network handles ferry routes; rideshare is heavy. The Red Line at South Station is a 10-minute walk. For employees coming from the suburbs by commuter rail, South Station + Silver Line is the standard pattern.
Are there life-sciences tenants in the Seaport?
Yes — Vertex (the anchor, 1.1M SF), Foundation Medicine, Sanofi Genzyme, and others. The Seaport has become the secondary life-sciences cluster in Boston after Cambridge / Kendall Square. Lab-conversion economics work better here than in Back Bay due to floor plate sizes.
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