• Browse Offices
  • Saved
  • Tour List
  • Move-in
Email us:info@tandem.space
CA DRE # 02234104NY DRE # 10311210503

Company

  • About

  • Blog

  • Contact Us

  • FAQs

  • Terms of Service

  • Privacy Policy

  • CA Disclosures

Offices

  • Browse Offices

  • San Francisco Offices

  • New York City Offices

  • Boston Offices

  • By State

  • Top Offices

Promote Your Space

  • For Landlords

  • For Brokers

  • For Tenants

© 2026 Tandem Space, Inc.
All rights reserved.

BostonDowntown

Vibrant Office Space in Boston's Downtown

21 Custom House St, Boston, MA, 02110-3510

Vibrant Office Space in Boston's Downtown

21 Custom House St, Boston, MA, 02110-3510
Space Thumbnail
Space Thumbnail
Image #2
1 of 2
space image 1

The Essentials

~

25

Desks

4

Meeting Room(s)

2,731

Sq Ft

About this office space

Welcome to this creative and inviting office space in the heart of Boston's Downtown. With ample natural light and a blend of modern finishes and open customizable areas, this space is perfect for dynamic teams looking to thrive in a vibrant environment.

Includes access to Custom House Fitness Center & onsite amenity of Cacao, a specialty coffee & chocolate shop.

NEIGHBORHOOD The area around 21 Custom House St is situated in Boston's Downtown, known for its bustling business district and historic charm. The neighborhood offers excellent public transit options, with South Station and Aquarium Station nearby, providing easy access to the Red and Blue Lines. Dining options abound, from quick bites at Quincy Market to upscale dining at Legal Sea Foods. Downtown Boston exudes a professional yet lively atmosphere, making it an ideal location for businesses and leisure alike.

MARKETED BY Melanie Cersosimo, Newmark Mel.cersosimo@nmrk.com

David Martel, Newmark david.martel@nmrk.com

What's included

Badge Access
Controlled Access
Guest Access
Natural Light
Proximity to Transit
24-hour access
Board Rooms
Elevator
Fitness Center
Meeting Rooms
Private Offices

Also includes Tandem concierge

We'll help you with the details at no extra cost:

Legal
Insurance
Furniture
Janitorial
Utilities
Internet
Learn More

Tour the space

Floor Plans

Space image 1

Location

Unlock full access with a free account

Interested in this office?

Create a free account to see all offices, schedule tours and get support from our expert leasing team

More offices nearby in Boston

Bright Office Space in Downtown Boston

88 Broad St, Suite 403

Downtown
$7,190/mo
16-26 people
4 Meeting Rooms
Bright Downtown Boston Office with Natural Light

2 Oliver St, Suite 502

Downtown
$11,130/mo
18-28 people
4 Meeting Rooms
Charming Brick Office with Natural Light

64 Broad St, 2nd Floor

Downtown
$10,030/mo
10-20 people
4 Meeting Rooms
Luc Hyman
Allegra Citak
Jackson Crawford
Sophie Frank
Peter Sellick

We'll lead your search

At no cost to you, our expert leasing team will help you go from exploring options to moving in.

Unlock full access with a free account

Interested in this office?

Create a free account to see all offices, schedule tours and get support from our expert leasing team