Flats on First

21 Charles St, Cambridge, MA 02141

Last Updated: 1 Day Ago
(2)

Managed By

Flats on First
Total Monthly Price
$3,161 - $6,579
Bedrooms
Studio - 3
Bathrooms
1 - 2
Sq. Ft.
439 - 1,305 sq ft

Pricing and Floor Plans

Cost Calculator: Estimate your monthly and one-time fees.

S1

$3,161 Total Monthly Price
Studio, 1 Bath
439 Sq. Ft.
Show Floor Plan Details
Oct. 29
Unit
Total Price
Sq. Ft.
Available
205B
$3,161
439
Oct. 29

A7

$3,967 Total Monthly Price
1 Bed, 1 Bath
755 Sq. Ft.
Show Floor Plan Details
3 Rentals Available
Unit
Total Price
Sq. Ft.
Available
520B
$3,967
767
Now
418B
$3,967
767
Sep. 18
609B
$3,967
764
Oct. 25

A10

$4,817 Total Monthly Price
1 Bed, 1 Bath
1,101 Sq. Ft.
Show Floor Plan Details
1 Rentals Available
Unit
Total Price
Sq. Ft.
Available
315B
$4,817
1,101
Now

A2

$4,017 Total Monthly Price
1 Bed, 1 Bath
718 Sq. Ft.
Show Floor Plan Details
Nov. 23
Unit
Total Price
Sq. Ft.
Available
404C
$4,017
718
Nov. 23

B7

$5,211 Total Monthly Price
2 Beds, 2 Baths
1,050 Sq. Ft.
Show Floor Plan Details
Oct. 6
Unit
Total Price
Sq. Ft.
Available
322B
$5,211
1,050
Oct. 6

B5

$4,896 Total Monthly Price
2 Beds, 1 Bath
909 Sq. Ft.
Show Floor Plan Details
Nov. 24
Unit
Total Price
Sq. Ft.
Available
507B
$4,896
909
Nov. 24

C1

$6,579 Total Monthly Price
3 Beds, 2 Baths
1,303 Sq. Ft.
Show Floor Plan Details
2 Rentals Available
Unit
Total Price
Sq. Ft.
Available
421B
$6,579
1,303
Now
221B
$6,579
1,305
Dec. 17
Show Unavailable Floor Plans (16)
* Price shown is total price based on community-supplied monthly required fees. Excludes user-selected optional fees and variable or usage-based fees and required charges due at or prior to move-in or at move-out. View Fees and Policies for details. Price, availability, fees, and any applicable rent special are subject to change without notice. * Square footage definitions vary. Displayed square footage is approximate.

Property Map

Select a unit to view pricing and availability

Details

Property Information

  • Built in 2021
  • 136 units5 stories

Fees & Policies

The fees below are based on community-supplied data and may exclude additional fees and utilities.

Utilities & Essentials

  • Monthly Electric/Gas Fee
    Varies / mo
  • Monthly Sewer Fee
    Varies / mo
  • Monthly Water Fee
    Varies / mo

One-Time Basics

Due at Move-In

  • Security Deposit
    $500
  • Deposit
    $500

Property Fee Disclaimer: Based on community-supplied data and independent market research. Subject to change without notice. May exclude fees for mandatory or optional services and usage-based utilities.

Matterport 3D Tours

Explore Commute Options

Drive Time
Walk Time
Bike Ride Time
Public Transit

Property Highlights

  • Balconies*
  • Bike Storage
  • Butterflymx Intercom System
  • Community Kitchen And Dining
  • Controlled Access Parking Garage
  • Co-Working Spaces
  • Direct Access Entry*
  • Full-Size, High Efficiency Washer/Dryer
  • Game Room
  • Gourmet Kitchens With Stainless Steel Appliances
  • Grilling And Al Fresco Dining
  • Groom Room
  • Landscaped Courtyards With Outdoor Seating
  • Luxury, Wood-Grained Vinyl Flooring
  • Open Air Amphitheater
  • Open Floor Plans
  • Outdoor Lounges With Fire Pits
  • Pet Friendly
  • Roof Deck With City Views
  • Schlage Smart Locks

Apartment Features

  • Balcony
  • Deck
  • Intercom
  • Kitchen
  • Quartz Countertops
  • Vinyl Flooring
  • Walk-In Closets
  • Wi-Fi

Community Features

  • Bicycle Storage
  • Controlled Access
  • Courtyard
  • Fitness Center
  • Gameroom
  • Income Restricted
  • Lounge
  • Package Service

Map of Flats on First

Area Scores

Walkability

Exceptionally walkable

Transit

Exceptional public transit

Driveability

Fairly drivable

Bikeability

Exceptionally bikeable

Scores provided by

Soundscore

Active

Scores provided by

Transit

Subway

3 min Walk

Green Line - E - Massachusetts Bay Transportation Authority Subway (The T) Massachusetts Bay Transportation Authority Subway

Subway

2 min Drive

Red Line - Massachusetts Bay Transportation Authority Subway (The T) MBTA

Subway

4 min Drive

Green Line - E - Massachusetts Bay Transportation Authority Subway (The T) Massachusetts Bay Transportation Authority Subway

Subway

6 min Drive

Orange Line - Massachusetts Bay Transportation Authority Subway (The T) MBTA

Commuter Rail

3 min Drive

Amtrak

Commuter Rail

4 min Drive

Airport

General Edward Lawrence Logan International

10 min Drive

Logan International

Moving to East Cambridge, Cambridge, MA

Shopping Centers

Shoppers will appreciate Flats on First proximity to Cambridgeside, Twin City Plaza, and Bunker Hill Mall. Cambridgeside is 0.6 miles away, and Twin City Plaza is within a 15 minute walk.

Commuting

With top-notch public transportation and a TransitScore of 90, East Cambridge is exceptional public transit. Within 3.9 miles of Flats on First, you’ll find Lechmere Station, Kendall Station, and Science Park Station.

Parks and Recreation

Recreational activities near Flats on First are plentiful. Discover 5 parks within 2.1 miles, including Museum of Science, Boston Public Garden, and Boston African American National Historic Site.

Airports

Living in East Cambridge provides easy access to General Edward Lawrence Logan International, located just 9 minutes from Flats on First.

Local Education

Primary and Secondary Schools

GreatSchools rating: 5 out of 10

Kennedy-Longfellow

Grades PK-5

Public

GreatSchools rating: 6 out of 10

Fletcher/Maynard Academy

Grades PK-5

Public

Not rated

Boston Children's School

Grades PK-5

Private

GreatSchools rating: 8 out of 10

Vassal Lane Upper School

Grades 6-8

Public

GreatSchools rating: 7 out of 10

Cambridge Street Upper School

Grades 6-8

Public

GreatSchools rating: 8 out of 10

Cambridge Rindge and Latin

Grades 9-12

Public

Not rated

Commonwealth School

Grades 9-12

Private

Not rated

The Newman School

Grades 6-12

Private

GreatSchools rating: 7 out of 10

Community Charter School of Cambridge

Grades 6-12

Public

Data provided by GreatSchools.org © 2026. All rights reserved.

GreatSchools

Colleges and Universities

School Commute Time (Distance)
MIT Drive: 3 min (1.4 mi)
Suffolk University Drive: 4 min (1.6 mi)
Bunker Hill Community College Drive: 4 min (2.1 mi)
Emerson College Drive: 6 min (2.1 mi)

About Flats on First

Flats on First embodies the best of boutique living, combining the luxuries of a modern apartment community with the comforts of a close-knit neighborhood. Come home to a place of sophistication and serenity in East Cambridge.

Flats on First is an apartment community in Cambridge, MA

Contact

Property Address:
21 Charles St,
Cambridge, MA 02141
Phone Number: (857) 380-0179
More Information:
View Property Website
Office Hours
  • Sunday Closed
  • Monday 10:00 AM – 6:00 PM
  • Tuesday 10:00 AM – 6:00 PM
  • Wednesday 10:00 AM – 6:00 PM
  • Thursday 10:00 AM – 6:00 PM
  • Friday 10:00 AM – 6:00 PM
  • Saturday 10:00 AM – 5:00 PM
Flats on First

Renter Reviews

For Flats on First

2.0

2 Ratings & Reviews

  • 4/15/23

    Poor management practices

    The apartments are modern and well-designed, if a bit small and short on storage space, and the appliances are way nicer than what you'd find in a normal apartment building in Boston. However, there is absolutely no insulation between floors. You will hear every step your upstairs neighbor takes, and each one will sound like a 20-lb weight being dropped on the floor. It's a shame because the building is otherwise very peaceful, and the neighborhood is really a nice place to live.

    Update:
    After four months of living here, I have to take off a star due to issues with the building services and the finishings in the unit. Just too many problems for what this place charges in rent.

    As far as the building goes:
    1) There's not a package room as is advertised on the website, and the package lockers have been down since late September, with no indication as to when they will be fixed. The building management blames the vendor, but they also haven't found any other solution to the problem. They just scatter everyone's packages all over the floor of the mail area, unsecured, and don't send any notifications when you receive something.
    2) The after-hours maintenance staff isn't responsive. There's not a number to call if you have an after-hours maintenance issue; you just have to submit a request through the resident app and hope someone sees it. I had a lock-out issue once, and, after waiting a half-hour for a maintenance person to arrive and then another 40 minutes for the person to try to unlock my door, I finally just went and stayed in a hotel for the night.

    As far as the units, the main window in my apartment is without window treatment of any kind. Management said something about them either ordering or receiving the wrong kind of blinds for that window and then told me I could provide the window treatment on my own. Not OK for what this place charges.

    Update #2: I can now echo one of the other reviews here. I've had packages go missing as well. Contrary to what the website says, there is no "24-hour package room". Management just lets packages be scattered all over the floors by the mailboxes, unsecured and unorganized. Not even a basic level of competence on display here.

    Review from Apartments.com

    1 Person Found This Helpful

    Property Manager at Flats on First responded to this review

    Hello There, we're disappointed to hear your experience wasn't up to par. We'd appreciate the chance to hear your concerns in-depth and suggest appropriate solutions. Please contact us at flatsonfirst@lincolnapts.com or 1 617-468-1400. We're confident that we can turn your experience around, and look forward to getting correcting it!

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Contact this Property

(857) 380-0179
Tour Options: In-Person

Languages: English

Closed Today

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