Flats on First Apartments

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21 Charles St, Cambridge, MA 02141
(781) 488-6207
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Flats on First

21 Charles St
Cambridge, MA 02141
(781) 488-6207
Flats on First in Cambridge, MA - Building Photo
  • Studio–3 Bedrooms
  • $3,427-$5,709Total Monthly Price
  • 439–1,303Square Feet

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 located in the East Cambridge Neighborhood and 02141 Zip code of Cambridge, MA. This community is professionally managed by Willow Bridge Property Company

Unique Features and Amenities

  • Balconies*
  • bike storage
  • ButterflyMX Intercom System
  • Community Kitchen and dining
  • Controlled Access Parking Garage
  • Co-Working Spaces
  • Direct Access Entry*
  • First Month's Rent Deposit
  • 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
  • Monthly Sewer Fee
  • MONTHLY WATER FEE
  • Open Air Amphitheater
  • Open floor plans
  • Outdoor lounges with fire pits
  • Personal Liability Insurance
  • Personal Liability Renters Insurance
  • Pet Friendly
  • Roof Deck With City Views
  • Schlage Smart Locks
  • Social Spaces With Complimentary Wifi
  • Stand-up Showers*
  • Walk-in closets*

See All Amenities

Property Contact Info

Floorplan Pricing and Availability

Flats on First offers Studio to 3 Bedroom apartments starting from $3,427 and having 439–1,303 sq ft. Here is the current pricing and availability:

  • Studio

    Floorplan S1

    From $3,427

    Studio, 1 Bath, 439 sq ft
    Total Monthly Price
    Available Dec 5

    Availability Details

    PriceAvailability DateUnitSq FtDeposit
    $3,427 December 5, 2025316B440$500

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Unit 316B Lease Information

    Unit Price

    • $3,427

    Deposit

    • $500 deposit

    Model Rent and Fees

    Model Price Range

    • $3,427 - $4,464

    Floorplan S2

    Studio, 1 Bath, 584 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityS2584 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan S3

    Studio, 1 Bath, 627 sq ft
     
    Largest StudioThis is the largest Studio at this Property

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityS3627 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops
    Show Unavailable Floorplans
  • 1 Bedroom

    Floorplan A1

    From $3,574

    1 Bed, 1 Bath, 699 sq ft
    Total Monthly Price
    Available Now
    Cheapest 1 BedroomThis is the cheapest 1 Bedroom at this Property

    Availability Details

    PriceAvailability DateUnitSq FtDeposit
    $3,574Available Now303C699$500

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Unit 303C Lease Information

    Unit Price

    • $3,574

    Deposit

    • $500 deposit

    Model Rent and Fees

    Model Price Range

    • $3,574 - $4,867

    Floorplan A9

    From $4,603

    1 Bed, 1 Bath, 914 sq ft
    Total Monthly Price
    Available Nov 10

    Availability Details

    PriceAvailability DateUnitSq FtDeposit
    $4,603 November 10, 2025213B914$500

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Unit 213B Lease Information

    Unit Price

    • $4,603

    Deposit

    • $500 deposit

    Model Rent and Fees

    Model Price Range

    • $4,603 - $6,039

    Floorplan A4H

    From $4,078

    1 Bed, 1 Bath, 896 sq ft
    Total Monthly Price
    Available Dec 14

    Availability Details

    PriceAvailability DateUnitSq FtDeposit
    $4,078 December 14, 2025102C896$500

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Unit 102C Lease Information

    Unit Price

    • $4,078

    Deposit

    • $500 deposit

    Model Rent and Fees

    Model Price Range

    • $4,078 - $5,059

    Floorplan A2

    1 Bed, 1 Bath, 718 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityA2718 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan A6

    1 Bed, 1 Bath, 747 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityA6747 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan A7

    1 Bed, 1 Bath, 755 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityA7755 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan A7H

    1 Bed, 1 Bath, 767 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityA7H767 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan A8

    1 Bed, 1 Bath, 794 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityA8794 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan A3

    1 Bed, 1 Bath, 813 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityA3813 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan A5

    1 Bed, 1 Bath, 897 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityA5897 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan A10

    1 Bed, 1 Bath, 1101 sq ft
     
    Largest 1 BedroomThis is the largest 1 Bedroom at this Property

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityA101101 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops
    Show Unavailable Floorplans
  • 2 Bedrooms

    Floorplan B8

    From $5,709

    2 Beds, 2 Baths, 1221 sq ft
    Total Monthly Price
    Available January 10, 2026
    Largest 2 BedroomThis is the largest 2 Bedroom at this Property

    Availability Details

    PriceAvailability DateUnitSq FtDeposit
    $5,709 January 10, 2026514B1221$500

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Unit 514B Lease Information

    Unit Price

    • $5,709

    Deposit

    • $500 deposit

    Model Rent and Fees

    Model Price Range

    • $5,709 - $7,681

    Floorplan B5

    2 Beds, 1 Bath, 909 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityB5909 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan B6

    2 Beds, 2 Baths, 933 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityB6933 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan B1

    2 Beds, 2 Baths, 977 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityB1977 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan B7

    2 Beds, 2 Baths, 1050 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityB71050 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan B2

    2 Beds, 2 Baths, 1149 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityB21149 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan B3

    2 Beds, 2 Baths, 1152 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityB31152 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops

    Floorplan B4

    2 Beds, 2 Baths, 1204 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityB41204 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops
    Show Unavailable Floorplans
  • 3 Bedrooms

    Floorplan C1

    3 Beds, 2 Baths, 1303 sq ft
     

    Availability Details

    Availability DateUnitSq Ft
    Call for AvailabilityC11303 sq ft

    Model Amenities and Features

    Features

    • Balcony
    • Intercom
    • Wi-Fi

    Kitchen

    • Kitchen
    • Quartz Countertops
Price shown is total price including community-supplied monthly required fees. Price, availability, fees, and any applicable rent special are subject to change without notice.

Schedule a Tour

Schedule a Tour
Call us at: (781) 488-6207 to schedule a tour.

Videos

Matterport 3D Tours

Property Information

Fees and Policies

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

Required Fees

One-Time Move-In Fees

Due at Move-In
Security DepositiOr up to 1 months rent based on application screening results$500
First Month's Rent DepositiCredited toward the required first month's rentVaries

Utilities & Essentials

Monthly Electric/Gas FeeiYou may be required to obtain applicable utilities independentlyVaries
Personal Liability InsuranceiObtain independent policy or use recommended insurerVaries
Monthly Sewer FeeiMonthly Water FeeVaries
Monthly Water FeeiMonthly Water FeeVaries

Other Fees

Personal Add-Ons

Garage RentaliGarage Rent$175/mo
Pet Renti$60 per cat. $85 per dog. 2 pet maximum.$50-$170/mo
Personal Liability Renters InsuranceiRecommended insurer if not submitting independent policy.$18.75/mo

Situational Fees

Key Fob ReplacementiKey Fob Replacement$5-$50/per occurrence
Month-to-Month FeeiMonth-to-Month Fee$700/per occurrence
Late FeeiApplied to rent over 30 days past dueVaries
NSF FeeiReturned check or rejected electronic payment fee$50/per occurrence
Additional Security DepositiUp to 1 months rent based on application screening resultsVaries
Lease Buy Out FeeiLease Buy Out FeeVaries
Automatic Renters Insurance (If coverage lapses)iPersonal liability renters insurance applied if previously obtained coverage lapses.$15/mo
Court FeeiLegal/Eviction FeeVaries
Legal/Eviction FeeiLegal/Eviction FeeVaries
Move Out Fob FeeiKey fob unreturned/lost at move-out.$50/per occurrence
Move Out Cleaning FeeiUnit returned unclean at move-outVaries
Move Out Damage FeeiFee for damages found at move-outVaries

Pet Policy and Fees

Cats

  • Fees Not Specified
  • 100 Lb Weight Limit
Restrictions:

Dogs

  • Fees Not Specified
  • 100 Lb Weight Limit
Restrictions:

Others

  • Fees Not Specified

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.

Features and Amenities

On-Site Services

  • Package Service

Community Features

  • Lounge

Outdoor Features

  • Courtyard
  • Controlled Access
  • Deck

Recreation and Fitness

  • Fitness Center
  • Bicycle Storage
  • Gameroom

Interior Features

  • Balcony
  • Intercom
  • Wi Fi

Kitchen Amenities

  • Kitchen
  • Quartz Countertops

Living Area Features

  • Walk In Closets
  • Vinyl Flooring
Google Map

Map

21 Charles St, Cambridge, MA 02141

Hours and Contact Info

Call Us - Open Now!
Currently Closed
By Appointment
Monday10:00 am–6:00 pm
Tuesday10:00 am–6:00 pm
Wednesday10:00 am–6:00 pm
Thursday10:00 am–6:00 pm
Friday10:00 am–6:00 pm
Saturday10:00 am–5:00 pm
SundayClosed

Getting Around

Walk Score®

96 / 100

Walker’s Paradise

Daily errands do not require a car

Bike Score®

98 / 100

Biker's Paradise

Daily errands can be accomplished on a bike

Transit Score®

80 / 100

Excellent Transit

Transit is convenient for most trips

Frequently Asked Questions about Flats on First

Where is Flats on First located?

Flats on First is located at 21 Charles St near the East Cambridge area of Cambridge, MA

What is the current rent range at Flats on First?

Studio to 3 Bedroom Apartments at Flats on First currently range from $3,427 to $5,709

When is the leasing office open?

  • The office Hours for Flats on First are
  • 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
  • Sunday Closed

Are pets allowed?

Call us today to find out our pet policy and if we allow pets

Lifestyle Ratings

  • Transit Friendly 3.4

    Transit Friendly apartments feature a fantastic location and great access to local mass transit.

Learn more about Lifestyle Search

Renters Reviews and Ratings

4.9
2 Renters Reviews
ⓘ How is this Rating Determined?The property ratings on ApartmentHomeLiving.com are created using a 5-star scale that includes average renter review scores combined with building ratings to determine an overall blended property score.

Building ratings are based on a community’s features, including the building design, construction, exterior spaces, and amenities. To learn more about the CoStar Building Rating System, refer to our official guidelines here.
  • Poor management practices

    April 14, 2023
    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.
    • Property Manager Responded

      April 18, 2023
      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!
    Read More
    Review from Apartments.com
  • Poor noise isolation

    September 5, 2022
    The facilities are all very nice and new but the noise isolation isn't up to par. I can hear upstairs stomping, showering, running taps etc. Just moved in and it's already getting on my nerves
    • Property Manager Responded

      September 15, 2022
      Hello There, Please be sure to contact our team to discuss this matter. Thank you, The Flats on First Team
    Review from Apartments.com

Nearby Schools

Cambridge Street Upper School

Cambridge
840 Cambridge Street
Public School - Grades 6-8 (293 Students)
In Attendance Zone2 minute drive / 0.7 miles away
5/10

Kennedy-Longfellow

Cambridge
158 Spring Street
Public School - Grades PK-5 (184 Students)
In Attendance Zone1 minute drive / 0.5 miles away
2/10

Fletcher/Maynard Academy

Cambridge
225 Windsor Street
Public School - Grades PK-5 (254 Students)
In Attendance Zone2 minute drive / 0.9 miles away
6/10

Cambridge Rindge and Latin

Cambridge
459 Broadway
Public School - Grades 9-12 (1867 Students)
In Attendance Zone5 minute drive / 1.8 miles away
8/10

Putnam Avenue Upper School

Cambridge
100 Putnam Avenue
Public School - Grades 6-8 (251 Students)
In Attendance Zone5 minute drive / 1.8 miles away
8/10
School data provided by GreatSchools.
details
The GreatSchools Rating helps parents compare schools within a state based on a variety of school quality indicators and provides a helpful picture of how effectively each school serves all of its students. Ratings are on scale of 1 (below average) and to 10 (above average) and can include test scores, college readiness, academic progress, advanced courses, equity, discipline and attendance data. We also advise parents to visit schools, consider other information on school performance and programs, and consider needs as part of the school selection process.

About GreatSchools Data on ApartmentHomeLiving.com.

Points of Interest

Time and distance from Flats on First.

Arts Museums and Landmarks

Museum of Science - Boston

1 Science Park
1 minute drive / 0.51 miles away

Bunker Hill Monument

Bunker Hill Monument
2 minute drive / 0.7 miles away

USS Constitution Museum

Charleston Navy Yard, Building 22
3 minute drive / 1.06 miles away

Big Box and Retail

Petco

119 1st St
1 minute drive / 0.19 miles away

Walgreens

16 Beacon St
3 minute drive / 1.2 miles away

Macy's

1 Summer St
4 minute drive / 1.46 miles away

Colleges and Universities

Bunker Hill Community College

250 Rutherford Avenue
1 minute drive / 0.62 miles away

Massachusetts Institute of Technology

77 Massachusetts Avenue
3 minute drive / 1.02 miles away

Suffolk University

8 Ashburton Place
3 minute drive / 1.3 miles away

Groceries

Star Market

53 Huntington Ave
4 minute drive / 1.53 miles away

Whole Foods

340 River St
5 minute drive / 1.84 miles away

Trader Joe's

748 Memorial Dr
5 minute drive / 1.92 miles away

Hospitals

Massachusetts Eye And Ear Infirmary

243 Charles Street
2 minute drive / 0.69 miles away

Massachusetts General Hospital

55 Fruit Street
2 minute drive / 0.78 miles away

Shriners Hospital For Children - Boston

51 Blossom Street
2 minute drive / 0.82 miles away

Military Bases

Boston Support Center

4 minute drive / 1.48 miles away

Hanscom Air Force Base

25 minute drive / 11.69 miles away

Parks and Recreation

The Boston Public Garden

87 Mount Vernon Street
3 minute drive / 1.01 miles away

Boston Common

Tremont Street
3 minute drive / 1.31 miles away

Freedom Trail

148 Tremont Street
3 minute drive / 1.32 miles away

Flats on First has 5 parks within 1.7 miles, including The Boston Public Garden, Boston Common, Freedom Trail, The Freedom Trail, and New England Holocaust Museum.

Restaurants and Dining

Modern Pastry

257 Hanover Street
4 minute drive / 1.37 miles away

Atlantic Fish Company

761 Boylston Street
4 minute drive / 1.44 miles away

Legal Sea Foods

255 State Street
4 minute drive / 1.63 miles away

Shopping Centers

Cambridgeside

100 Cambridgeside Pl
1 minute drive / 0.25 miles away

Twin City Plaza

14-22 McGrath Hwy
1 minute drive / 0.38 miles away

Bunker Hill Mall

5-31 Austin St
2 minute drive / 0.8 miles away

Flats on First has 5 shopping centers within 1.5 miles.

Transit Stations

Lechmere Station-Green Line - E

85 Cambridge St
1 minute drive / 0.15 miles away

Community College Station-Orange Line

Austin Street and Rutherford Ave
1 minute drive / 0.58 miles away

Kendall Station-Red Line

97 Carleton St
1 minute drive / 0.61 miles away

Nearby Neighborhoods

Studio to 5 Bedroom Apartments from $995
View Rentals
Studio to 6 Bedroom Apartments from $975
View Rentals
Studio to 6 Bedroom Apartments from $975
View Rentals

Rental Price Ranges in the Area

BedroomAverage PriceCheapest PriceHighest Price
Cambridge Studio Apartments $2,704$1,200$7,751
Cambridge 1 Bedroom Apartments $3,109$950$10,000+
Cambridge 2 Bedroom Apartments $3,742$375$10,000+
Cambridge 3 Bedroom Apartments $4,194$995$10,000+
Cambridge 4 Bedroom Apartments $5,120$1,200$10,000+
Cambridge 5 Bedroom Apartments $6,275$975$10,000+
Cambridge 6 Bedroom Apartments $8,235$1,150$10,000+

Browse Top Apartments in Cambridge

Viewing: Flats on First | Desktop Version | Listing Updated: 11/02/2025 | AHLDIA