--- title: "Boston Class A Office Market" description: "Life sciences capital — and a deep traditional CBD." canonical: https://classa.info/cities/boston pageType: city lastUpdated: 2026-04-15T00:00:00.000Z license: "CC BY 4.0 with attribution to Class A Atlas (https://classa.info)." --- > Boston Class A office rents around $78/sqft/yr, with 19.5% vacancy and 18 months of typical rent-free on a 10-year term. ## TL;DR - Cambridge / Kendall Square hold the world's deepest life-sciences cluster. - Seaport delivered a wave of new Class A — now in lease-up. - Office vacancy 18-22% in the CBD; lab vacancy structurally tighter. - Lease-up rent-free of 18-24 months on a 10-year term. - ESG retrofits accelerating across older CBD stock. # Boston Class A Office Market *Life sciences capital — and a deep traditional CBD.* ## TL;DR - Cambridge / Kendall Square hold the world's deepest life-sciences cluster. - Seaport delivered a wave of new [Class A](/glossary/class-a) — now in lease-up. - Office vacancy 18-22% in the CBD; lab vacancy structurally tighter. - Lease-up rent-free of 18-24 months on a 10-year term. - ESG retrofits accelerating across older CBD stock. ## Overview Boston combines the deepest life-sciences cluster in the world with a traditional financial-and-legal CBD. Lab space drives marginal demand; Class A office is mid-cycle through a softer reset. ## Market snapshot | Class A rent | 78 USD/sqft/yr (78 USD)| | Vacancy | 19.5%| | Typical lease length | 10 years| | Typical rent-free | 18 months| Composite Q1 2026 Boston Class A and lab reports. ## Lease norms Modified-gross with op-ex escalations. Rent-free 18-24 months on 10-year term standard. Lab leases carry distinct economics — base rent plus operating expenses plus utilities pass-through. ## Transit & access MBTA subway, commuter rail, and Logan Airport access. Silver Line connects the Seaport to South Station. ## Tax Combined federal + Massachusetts corporate tax 28%. ## Talent Deepest STEM and life-sciences talent pool in the US — anchored by MIT, Harvard, BU. Average all-in compensation indexes 95. ## Notable Class A buildings - **One Lincoln Street** [](https://www.google.com/maps/search/?api=1&query=One%20Lincoln%20Street%2C%201%20Lincoln%20Street%2C%20Boston%2C%20MA%2002111%2C%20Financial%20District%2C%20Boston%2C%20United%20States&query_place_id=ChIJM2wKRQBx44kRYk1X1awSoxU) · Financial District - **Winthrop Center** [](https://www.google.com/maps/search/?api=1&query=Winthrop%20Center%2C%20115%20Winthrop%20Square%2C%20Boston%2C%20MA%2002110%2C%20Financial%20District%2C%20Boston%2C%20United%20States&query_place_id=ChIJK48KUaFx44kR1t8odvqQRTw) · Financial District - **100 Binney Street** [](https://www.google.com/maps/search/?api=1&query=100%20Binney%20Street%2C%20100%20Binney%20Street%2C%20Cambridge%2C%20MA%2002142%2C%20Cambridge%20%2F%20Kendall%20Square%2C%20Boston%2C%20United%20States&query_place_id=ChIJKWASyKRw44kRsgkjYBOr5ao) · Cambridge / Kendall Square - **121 Seaport Boulevard** [](https://www.google.com/maps/search/?api=1&query=121%20Seaport%20Boulevard%2C%20121%20Seaport%20Boulevard%2C%20Boston%2C%20MA%2002210%2C%20Seaport%2C%20Boston%2C%20United%20States&query_place_id=ChIJoZ-xir1x44kRInkX57HRbPc) · Seaport ## Class A submarkets in Boston - [**Financial District**](/cities/boston/financial-district) — Boston's traditional CBD. (trophy) - [**Cambridge & Kendall Square**](/cities/boston/cambridge-kendall) — Life sciences capital of the world. (trophy) - [**Seaport**](/cities/boston/seaport) — Boston's newest trophy quarter. (trophy) - [**Back Bay**](/cities/boston/back-bay) — Boston's brownstone HQ corridor. (prime) - [**Kendall Square**](/cities/boston/kendall-square) — The world's densest biotech cluster. (trophy) - [**Post Office Square**](/cities/boston/post-office-square) — Boutique trophy core within the Financial District. (trophy) ## Boston deep-dives - [Rents and incentives](/cities/boston/topics/rents-and-incentives) — What does Class A rent cost and what concessions are typical? - [Sublease market](/cities/boston/topics/sublease-market) — How deep is [sublease](/topics/sublease-strategy)">sublease availability and how does it price? - [ESG and LEED stock](/cities/boston/topics/esg-and-leed) — How much certified stock exists and what premium does it command? - [Transit and commute](/cities/boston/topics/transit-and-commute) — Which submarkets have the strongest transit access? - [Talent and salaries](/cities/boston/topics/talent-and-salaries) — What does the white-collar talent pool look like and how is it priced? - [Fit-out costs](/cities/boston/topics/fit-out-costs) — What does a Class A [fit-out](/topics/fit-out-capex)">fit-out cost per square foot? - [Flex vs lease](/cities/boston/topics/flex-vs-lease) — When does premium [coworking](/topics/lease-vs-flex) beat a traditional lease? - [Taxes and incentives](/cities/boston/topics/taxes-and-incentives) — What corporate, occupancy, and property taxes apply? - [Neighborhoods overview](/cities/boston/topics/neighborhoods-overview) — Which Class A submarkets exist and how do they compare? - [Notable buildings](/cities/boston/topics/notable-buildings) — Which trophy assets define the market? - [Class A vs Class B](/cities/boston/topics/class-a-vs-class-b) — What is the spread between Class A and [Class B](/glossary/class-b) and why? - [Leasing conventions](/cities/boston/topics/leasing-conventions) — What lease structures, terms, and concessions are normal? - [Expansion checklist](/cities/boston/topics/expansion-checklist) — What is the operational checklist for opening here? - [Relocation guide](/cities/boston/topics/relocation-guide) — How do you move into this market from another city? - [Frequently asked questions](/cities/boston/topics/faq) — Quick answers to the questions occupiers ask most. - [Operating expenses](/cities/boston/topics/operating-expenses) — What service charges, OpEx, and pass-throughs apply on top of rent? - [Growth and availability](/cities/boston/topics/growth-and-availability) — How tight is current availability and what does the pipeline look like? - [Sustainability pathways](/cities/boston/topics/sustainability-pathways) — How do tenants land net-zero or science-based-target leases here? - [Hybrid work policy](/cities/boston/topics/hybrid-work-policy) — How are hybrid policies shaping office demand here? - [Security and redundancy](/cities/boston/topics/security-and-redundancy) — What security, power, and connectivity redundancy are standard? - [Lab and R&D space](/cities/boston/topics/lab-and-r-and-d) — What does R&D-grade or wet-lab space look like in this market? - [Brand experience](/cities/boston/topics/brand-experience) — How do trophy buildings function as brand experiences and showpieces? - [Fund strategy and flag](/cities/boston/topics/fund-strategy-and-flag) — Which submarkets carry the strongest investor flag for funds? - [Exit and renewal](/cities/boston/topics/exit-and-renewal) — How do you handle a Class A [renewal](/topics/lease-renewal-strategy) or exit cleanly here? - [Market cycle position](/cities/boston/topics/market-cycle-position) — Where is this Class A market in its cycle right now? ## Boston — frequently compared - [**Boston vs Austin**](/compare/austin-vs-boston) — Americas HQ shortlist: Austin vs Boston. - [**Boston vs Chicago**](/compare/boston-vs-chicago) — Americas HQ shortlist: Boston vs Chicago. - [**Boston vs Los Angeles**](/compare/boston-vs-los-angeles) — Americas HQ shortlist: Boston vs Los Angeles. - [**Boston vs Miami**](/compare/boston-vs-miami) — Americas HQ shortlist: Boston vs Miami. - [**Boston vs New York**](/compare/boston-vs-new-york) — Americas HQ shortlist: Boston vs New York. - [**Boston vs San Francisco**](/compare/boston-vs-san-francisco) — Americas HQ shortlist: Boston vs San Francisco. ## Frequently asked questions ****Why is Cambridge / Kendall Square so dominant in life sciences?**** : MIT and Harvard adjacency, plus 30 years of cumulative cluster effects across pharma, biotech, and venture capital, have created the densest life-sciences talent and capital pool in the world. ## Editorial provenance Reviewed by [**Miriam Hollander**](/about/authors/miriam-hollander) — Lead market analyst. Last updated 2026-04-15. See our [methodology](/about/methodology) and [editorial standards](/about/editorial-standards). ### Primary sources for this page - [CBRE Marketview reports](https://www.cbre.com/insights) — CBRE - [JLL Office Insight](https://www.jll.com/en/trends-and-insights) — JLL - [Cushman & Wakefield Marketbeat](https://www.cushmanwakefield.com/en/insights) — Cushman & Wakefield - [Savills World Research](https://www.savills.com/research_articles/) — Savills - [Colliers Global Office Outlook](https://www.colliers.com/en/research) — Colliers [Full sources index](/about/sources) · [Submit a correction](/about/corrections) ## Related topics - [**Class A Lease Negotiation**](/topics/class-a-lease-negotiation) — How to negotiate a Class A office lease — the playbook from LOI to signed deal. - [**Hybrid Workplace Strategy**](/topics/hybrid-workplace-strategy) — How to size, structure, and lease a Class A office for a hybrid workforce. - [**ESG / LEED for Tenants**](/topics/esg-leed-tenants) — How tenants evaluate, negotiate, and report on ESG performance in a Class A office lease. - [**Cross-border Expansion**](/topics/cross-border-expansion) — How to run a coordinated Class A office search across multiple geographies. - [**Fit-out Capex**](/topics/fit-out-capex) — How to budget, sequence, and govern Class A office fit-out capex. - [**Lease vs Flex**](/topics/lease-vs-flex) — When premium flex (coworking, managed office) beats a conventional Class A lease — and vice versa. --- Citation: Source: Class A Atlas (https://classa.info/cities/boston), updated 2026-04-15T00:00:00.000Z.