Flats on First
21 Charles St,
Cambridge,
MA
02141
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Total Monthly Price
$2,852 - $7,734
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Bedrooms
Studio - 3 bd
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Bathrooms
1 - 2 ba
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Square Feet
439 - 1,303 sq ft
Highlights
- Walker's Paradise
- Bike-Friendly Area
- Walk-In Closets
- Deck
- Controlled Access
- Balcony
Pricing & Floor Plans
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Unit 423Bprice $2,852square feet 465availibility Now
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Unit 217Bprice $2,852square feet 443availibility Feb 27
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Unit 303Cprice $3,406square feet 699availibility Now
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Unit 213Bprice $4,287square feet 914availibility Now
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Unit 204Bprice $3,628square feet 795availibility Feb 4
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Unit 207Bprice $4,569square feet 911availibility Now
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Unit 407Bprice $4,569square feet 909availibility Mar 24
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Unit 514Bprice $5,334square feet 1,221availibility Now
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Unit 522Bprice $4,884square feet 1,050availibility Feb 9
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Unit 423Bprice $2,852square feet 465availibility Now
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Unit 217Bprice $2,852square feet 443availibility Feb 27
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Unit 303Cprice $3,406square feet 699availibility Now
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Unit 213Bprice $4,287square feet 914availibility Now
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Unit 204Bprice $3,628square feet 795availibility Feb 4
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Unit 207Bprice $4,569square feet 911availibility Now
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Unit 407Bprice $4,569square feet 909availibility Mar 24
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Unit 514Bprice $5,334square feet 1,221availibility Now
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Unit 522Bprice $4,884square feet 1,050availibility Feb 9
Fees and Policies
The fees below are based on community-supplied data and may exclude additional fees and utilities. Use the Cost Calculator to add these fees to the base price.
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Utilities & Essentials
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Personal Liability InsuranceObtain independent policy or use recommended insurer Charged per unit.Varies
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Monthly Sewer FeeMonthly Water Fee Charged per unit.Varies
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Monthly Water FeeMonthly Water Fee Charged per unit.Varies
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Monthly Electric/Gas FeeYou may be required to obtain applicable utilities independently Charged per unit.Varies / mo
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One-Time Basics
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Due at Move-In
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Security DepositOr up to 1 months rent based on application screening results Charged per unit.$500
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First Month's Rent DepositCredited toward the required first month's rent Charged per unit.Varies
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Due at Move-In
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Dogs
100 lbs. Weight LimitRestrictions:NoneRead More Read LessComments
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Cats
100 lbs. Weight LimitRestrictions:Comments
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Other Pets
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Pet Rent$60 per cat. $85 per dog. 2 pet maximum. Charged per pet.$50 - $170 / mo
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Other
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Garage RentalGarage Rent Charged per vehicle.$175 / mo
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Personal Liability Renters InsuranceRecommended insurer if not submitting independent policy. Charged per unit.$18.75 / mo
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Additional Security DepositUp to 1 months rent based on application screening results Charged per unit.Varies
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Automatic Renters Insurance (If coverage lapses)Personal liability renters insurance applied if previously obtained coverage lapses. Charged per unit.$15 / mo
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NSF FeeReturned check or rejected electronic payment fee Charged per unit.$50 / occurrence
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Month-to-Month FeeMonth-to-Month Fee Charged per unit.$700 / occurrence
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Move Out Damage FeeFee for damages found at move-out Charged per unit.Varies
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Court FeeLegal/Eviction Fee Charged per unit.Varies
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Lease Buy Out FeeLease Buy Out Fee Charged per unit.Varies
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Key Fob ReplacementKey Fob Replacement Charged per unit.$5 - $50 / occurrence
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Move Out Fob FeeKey fob unreturned/lost at move-out. Charged per unit.$50 / occurrence
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Move Out Cleaning FeeUnit returned unclean at move-out Charged per unit.Varies
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Late FeeApplied to rent over 30 days past due Charged per unit.Varies / occurrence
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Legal/Eviction FeeLegal/Eviction Fee Charged per unit.Varies
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.
Details
Property Information
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Built in 2021
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136 units/5 stories
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Energy Star Rated
Matterport 3D Tours
Select a unit to view pricing & availability
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 located in Middlesex County and the 02141 ZIP Code. This area is served by the Cambridge attendance zone.
Unique Features
- Game Room
- Outdoor Lounges With Fire Pits
- Pet Friendly
- Schlage Smart Locks
- Balconies*
- Social Spaces With Complimentary Wifi
- Direct Access Entry*
- Bike Storage
- Gourmet Kitchens With Stainless Steel Appliances
- Groom Room
- Butterflymx Intercom System
- Grilling And Al Fresco Dining
- Open Air Amphitheater
- Open Floor Plans
- Roof Deck With City Views
- Community Kitchen And Dining
- Landscaped Courtyards With Outdoor Seating
- Luxury, Wood-Grained Vinyl Flooring
- Walk-In Closets*
- Controlled Access Parking Garage
- Co-Working Spaces
- Full-Size, High Efficiency Washer/Dryer
- Stand-Up Showers*
Community Amenities
Fitness Center
Controlled Access
Bicycle Storage
Package Service
- Package Service
- Controlled Access
- Lounge
- Fitness Center
- Bicycle Storage
- Gameroom
- Courtyard
Apartment Features
Walk-In Closets
Wi-Fi
Deck
Vinyl Flooring
- Wi-Fi
- Intercom
- Kitchen
- Quartz Countertops
- Vinyl Flooring
- Walk-In Closets
- Balcony
- Deck
- Package Service
- Controlled Access
- Lounge
- Courtyard
- Fitness Center
- Bicycle Storage
- Gameroom
- Game Room
- Outdoor Lounges With Fire Pits
- Pet Friendly
- Schlage Smart Locks
- Balconies*
- Social Spaces With Complimentary Wifi
- Direct Access Entry*
- Bike Storage
- Gourmet Kitchens With Stainless Steel Appliances
- Groom Room
- Butterflymx Intercom System
- Grilling And Al Fresco Dining
- Open Air Amphitheater
- Open Floor Plans
- Roof Deck With City Views
- Community Kitchen And Dining
- Landscaped Courtyards With Outdoor Seating
- Luxury, Wood-Grained Vinyl Flooring
- Walk-In Closets*
- Controlled Access Parking Garage
- Co-Working Spaces
- Full-Size, High Efficiency Washer/Dryer
- Stand-Up Showers*
- Wi-Fi
- Intercom
- Kitchen
- Quartz Countertops
- Vinyl Flooring
- Walk-In Closets
- Balcony
- Deck
| Monday | 10am - 6pm |
|---|---|
| Tuesday | 10am - 6pm |
| Wednesday | 10am - 6pm |
| Thursday | 10am - 6pm |
| Friday | 10am - 6pm |
| Saturday | 10am - 5pm |
| Sunday | Closed |
Cambridge, situated along the Charles River, combines academic excellence with historic charm. As home to Harvard University and the Massachusetts Institute of Technology (MIT), the city maintains a strong intellectual presence while offering diverse neighborhood experiences. Harvard Square features historic architecture, independent bookstores, and local cafes, while Kendall Square has emerged as a global technology and research center. Outdoor enthusiasts appreciate the Charles River Esplanade and Fresh Pond Reservation, which provides 162 acres of walking trails around a glacial lake. The city offers various housing styles, from preserved Victorian buildings in Mid-Cambridge to contemporary apartments in East Cambridge, with concentrated residential areas near Harvard Square, Central Square, and Kendall Square.
The rental market in Cambridge reflects high demand, with current average rents at $3,297 for one-bedroom apartments (up 3.
Learn more about living in Cambridge| Colleges & Universities | Distance | ||
|---|---|---|---|
| Colleges & Universities | Distance | ||
| Drive: | 3 min | 1.4 mi | |
| Drive: | 4 min | 1.6 mi | |
| Drive: | 4 min | 2.1 mi | |
| Drive: | 6 min | 2.1 mi |
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 a scale of 1 (below average) 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 family needs as part of the school selection process.
View GreatSchools Rating Methodology
Data provided by GreatSchools.org © 2026. All rights reserved.
Transportation options available in Cambridge include Lechmere Station, located 0.3 mile from Flats on First. Flats on First is near General Edward Lawrence Logan International, located 4.3 miles or 9 minutes away.
| Transit / Subway | Distance | ||
|---|---|---|---|
| Transit / Subway | Distance | ||
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Walk: | 5 min | 0.3 mi |
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Walk: | 12 min | 0.6 mi |
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Walk: | 18 min | 0.9 mi |
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Drive: | 6 min | 2.4 mi |
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Drive: | 4 min | 2.4 mi |
| Commuter Rail | Distance | ||
|---|---|---|---|
| Commuter Rail | Distance | ||
|
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Drive: | 4 min | 1.2 mi |
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Drive: | 8 min | 2.3 mi |
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Drive: | 4 min | 2.5 mi |
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Drive: | 9 min | 3.3 mi |
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Drive: | 9 min | 4.4 mi |
| Airports | Distance | ||
|---|---|---|---|
| Airports | Distance | ||
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General Edward Lawrence Logan International
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Drive: | 9 min | 4.3 mi |
Time and distance from Flats on First.
| Shopping Centers | Distance | ||
|---|---|---|---|
| Shopping Centers | Distance | ||
| Walk: | 4 min | 0.2 mi | |
| Walk: | 15 min | 0.8 mi | |
| Walk: | 18 min | 1.0 mi |
| Parks and Recreation | Distance | ||
|---|---|---|---|
| Parks and Recreation | Distance | ||
|
Museum of Science
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Walk: | 10 min | 0.5 mi |
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Boston African American National Historic Site
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Drive: | 5 min | 1.7 mi |
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Boston Public Garden
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Drive: | 6 min | 2.1 mi |
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New England Aquarium
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Drive: | 5 min | 2.1 mi |
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Boston National Historical Park
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Drive: | 5 min | 2.1 mi |
| Hospitals | Distance | ||
|---|---|---|---|
| Hospitals | Distance | ||
| Drive: | 3 min | 1.1 mi | |
| Drive: | 3 min | 1.2 mi | |
| Drive: | 3 min | 1.3 mi |
| Military Bases | Distance | ||
|---|---|---|---|
| Military Bases | Distance | ||
| Drive: | 28 min | 14.2 mi | |
| Drive: | 33 min | 18.0 mi |
Flats on First Photos
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1BR, 1BA - 684SF
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Models
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Studio
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Studio
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Studio
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1 Bedroom
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1 Bedroom
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1 Bedroom
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Flats on First does not offer in-unit laundry or shared facilities. Please contact the property to learn about nearby laundry options.
Utilities are not included in rent. Residents should plan to set up and pay for all services separately.
Parking is available at Flats on First for $175 / mo. Contact this property for details.
Flats on First has studios to three-bedrooms with rent ranges from $2,852/mo. to $7,734/mo.
Yes, Flats on First welcomes pets. Breed restrictions, weight limits, and additional fees may apply. View this property's pet policy.
A good rule of thumb is to spend no more than 30% of your gross income on rent. Based on the lowest available rent of $2,852 for a studio, you would need to earn about $103,000 per year to qualify. Want to double-check your budget? Try our Rent Affordability Calculator to see how much rent fits your income and lifestyle.
Flats on First is offering 1 Month Free for eligible applicants, with rental rates starting at $2,852.
Yes! Flats on First offers 5 Matterport 3D Tours. Explore different floor plans and see unit level details, all without leaving home.
What Are Walk Score®, Transit Score®, and Bike Score® Ratings?
Walk Score® measures the walkability of any address. Transit Score® measures access to public transit. Bike Score® measures the bikeability of any address.
What is a Sound Score Rating?
A Sound Score Rating aggregates noise caused by vehicle traffic, airplane traffic and local sources
21 Charles St
Cambridge, MA 02141