10 Post Office Square, Financial District, Boston, MA

10 Post Office Square is a landmark 14-story office building located in the epicenter of Boston’s Financial District, adjacent to Post Office Square Park. This trophy office building was built in 1924 and renovated by Synergy in 2017, and again in 2025, the most recent major repositioning delivered a full rebranding of the asset. Upgrades include a new lobby & entrance and a full tenant-only amenity floor that features a fitness center with full-service locker-rooms & showers, a conference & training center, a luxurious tenant lounge and multiple new restaurants & entertainment concepts.

10 Post Office Square’s location also provides premier accessibility for commuters as it accesses public transportation to all MBTA’s lines at State Street (Blue and Orange Lines), Downtown Crossing (Red and Orange Lines), Park Street (Green and Red Lines) and Commuter Rail and Amtrak access at North Station and South Station. There is also swift accessibility to Interstate 90 (Massachusetts Turnpike), Interstate 93 and Logan International Airport. 

Rentable Area

451,947 sf

Total floors

Year Built

1924

Year Renovated

2025

A Landmark
In Luxury

<p class="text-size-title-64" textalign="center" style="text-align: center"><span class="text-size-title-64"><strong>A Landmark</strong></span></p><p class="text-size-title-64" textalign="center" style="text-align: center"><span class="text-size-title-64"><strong>In Luxury</strong></span></p> at 10 Post Office Square

Restaurants

Lifestyle & Entertainment

(13) New England Aquarium | (14) Barry’s Bootcamp | (15) Equinox | (16) Planet Fitness

Hotels

(17) Hyatt Regency | (18) The Ritz-Carlton | (19) The Langham

<p class="text-size-header-32">The Neighborhood</p> at 10 Post Office Square

Synergy recently completed a major repositioning of 10 Post Office Square that brought a brand new suite of luxurious amenities to the building:

Renovated Building Entrance

New Main Lobby

Elevator Lobby & Reception Seating

New Lobby Café

Tenant-Only Amenity Floor

Conference Center

Executive Board Room

Multi-Purpose Training Room

Exclusive Tenant-Only Lounge

State-of-the-Art Fitness Center
With Full Service Locker Rooms

<p class="text-size-header-32">State-of-the-Art Fitness Center</p><p class="text-size-header-32"></p><p class="text-size-header-32">With Full Service Locker Rooms</p> at 10 Post Office Square

Strength & Cardio Machines, Free Weights, and Recovery Room

Mariel Restaurant

New Cocktail Lounge: MyGirl

New High-End Restaurant Coming in 2026

Private Members Club Coming in 2026

Partial 6th Floor, Suite N625 - North Tower
- Size
  
  6,747 sf
- Condition
  
  pre-existing
- Lease Type
  
  direct
- Available
  
  Now
View Details
Partial 7th Floor, Suite S705 - South Tower
- Size
  
  2,994 sf
- Condition
  
  pre-existing
- Lease Type
  
  direct
- Available
  
  Now
- 20
View Details
Partial 10th Floor, Suite S1000 - South Tower
- Size
  
  14,996 sf
- Condition
  
  pre-existing
- Lease Type
  
  direct
- Available
  
  2026-11-01
- 100
View Details
Partial 11th Floor, Suite S1150
- Size
  
  3,556 sf
- Condition
  
  pre-existing
- Lease Type
  
  direct
- Available
  
  2026-04-18
View Details
Partial S6, Suite S610
- Size
  
  2,694 sf
- Condition
  
  pre-existing
- Lease Type
  
  direct
- Available
  
  Now
View Details
Partial Nmezz, Suite N1M1
- Size
  
  7,880 sf
- Condition
  
  core and shell
- Lease Type
  
  direct
- Available
  
  Now
- 53
View Details
Partial S11th, Suite S1125 - South Tower
- Size
  
  5,432 sf
- Condition
  
  pre-existing
- Lease Type
  
  direct
- Available
  
  2026-03-01
View Details
Entire N2, Suite N200
- Size
  
  13,940 sf
- Condition
  
  floor and shell
- Lease Type
  
  direct
- Available
  
  Now
View Details
Entire N3, Suite N300
- Size
  
  16,977 sf
- Condition
  
  floor and shell
- Lease Type
  
  direct
- Available
  
  Now
View Details
Entire N5, Suite N510
- Size
  
  4,790 sf
- Condition
  
  floor and shell
- Lease Type
  
  direct
- Available
  
  Now
View Details
Partial N4, Suite N405
- Size
  
  5,027 sf
- Condition
  
  pre-existing
- Lease Type
  
  direct
- Available
  
  Now
View Details
Entire S2, Suite S200
- Size
  
  17,605 sf
- Condition
  
  core and shell
- Lease Type
  
  direct
- Available
  
  Now
View Details
Partial N9, Suite N990 - North Tower
- Size
  
  3,005 sf
- Condition
  
  2nd generation
- Lease Type
  
  direct
- Available
  
  Now
- 19
View Details
Partial S5, Suite S501
- Size
  
  3,570 sf
- Condition
  
  pre-existing
- Lease Type
  
  direct
- Available
  
  Now
View Details

Overview	Size	Condition	Lease Type	Availability	Asking Rent
Partial 6th Floor, Suite N625 - North Tower	6,747 sf	pre-existing	direct	Now	-	View Details
Partial 7th Floor, Suite S705 - South Tower 20	2,994 sf	pre-existing	direct	Now	-	View Details
Partial 10th Floor, Suite S1000 - South Tower 100	14,996 sf	pre-existing	direct	2026-11-01	-	View Details
Partial 11th Floor, Suite S1150	3,556 sf	pre-existing	direct	2026-04-18	-	View Details
Partial S6, Suite S610	2,694 sf	pre-existing	direct	Now	-	View Details
Partial Nmezz, Suite N1M1 53	7,880 sf	core and shell	direct	Now	-	View Details
Partial S11th, Suite S1125 - South Tower	5,432 sf	pre-existing	direct	2026-03-01	-	View Details
Entire N2, Suite N200	13,940 sf	floor and shell	direct	Now	-	View Details
Entire N3, Suite N300	16,977 sf	floor and shell	direct	Now	-	View Details
Entire N5, Suite N510	4,790 sf	floor and shell	direct	Now	-	View Details
Partial N4, Suite N405	5,027 sf	pre-existing	direct	Now	-	View Details
Entire S2, Suite S200	17,605 sf	core and shell	direct	Now	-	View Details
Partial N9, Suite N990 - North Tower 19	3,005 sf	2nd generation	direct	Now	-	View Details
Partial S5, Suite S501	3,570 sf	pre-existing	direct	Now	-	View Details

BS

Bryan Sparkes

Managing Director

JLL

(617) 531-4234
bryan.sparkes@am.jll.com
DC

Dan Cavanaugh

JLL

(617) 316-6490
dan.cavanaugh@am.jll.com
RW

Roger W. Breslin

Managing Director

JLL

(617) 531-4146
roger.breslin@am.jll.com
TF

Tim Ferguson

Synergy Investments
tferguson@synergyboston.com

Building Overview

A LandmarkIn Luxury

Location

The Neighborhood

New Class A Amenities

Renovated Building Entrance

New Main Lobby

Elevator Lobby & Reception Seating

New Lobby Café

Tenant-Only Amenity Floor

Conference Center

Executive Board Room

Multi-Purpose Training Room

Exclusive Tenant-Only Lounge

State-of-the-Art Fitness CenterWith Full Service Locker Rooms

Strength & Cardio Machines, Free Weights, and Recovery Room

Mariel Restaurant

New Cocktail Lounge: MyGirl

New High-End Restaurant Coming in 2026

Private Members Club Coming in 2026

Gallery

Leasing Availability

Partial 6th Floor, Suite N625 - North Tower

Partial 7th Floor, Suite S705 - South Tower

Partial 10th Floor, Suite S1000 - South Tower

Partial 11th Floor, Suite S1150

Partial S6, Suite S610

Partial Nmezz, Suite N1M1

Partial S11th, Suite S1125 - South Tower

Entire N2, Suite N200

Entire N3, Suite N300

Entire N5, Suite N510

Partial N4, Suite N405

Entire S2, Suite S200

Partial N9, Suite N990 - North Tower

Partial S5, Suite S501