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.
Apartment for rent
$6,629/mo
21 Charles St, # 421B, Cambridge, MA 02141
3beds
1,303sqft
This listing now includes required monthly fees in the total monthly price. Price shown reflects the lease term provided. Learn more|
Apartment
Available Wed Aug 19 2026
Cats, dogs OK
In unit laundry
Garage parking
Other
What's special
- 5 days |
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Listing updated:
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Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 3
- Bathrooms: 2
- Full bathrooms: 2
Heating
- Other
Appliances
- Included: dryer, washer
- Laundry: In Unit, Other
Features
- Other, Storage
- Flooring: Vinyl
Interior area
- Total interior livable area: 1,303 sqft
Property
Parking
- Parking features: Deck, Direct Access, Garage, Open, Other, Storage
- Has garage: Yes
- Has uncovered spaces: Yes
- Details: Contact manager
Features
- Patio & porch: Deck, Other, Patio
- Exterior features: Barbecue, Other, Storage
- Has view: Yes
- View description: Roof Deck With City Views
Lot
- Features: Landscaped, Other, Views
Details
- Additional structures: Garage(s), Other, Storage
- Other equipment: Intercom, Other
Construction
Type & style
- Home type: Apartment
- Property subtype: Apartment
Building
Details
- Building name: Flats on First
Management
- Pets allowed: Yes
Community & HOA
Community
- Features: Fitness Center, Gated, Other
- Security: Other
HOA
- Amenities included: Fitness Center, Game Room, Other, Parking, Roof Deck, Storage
Location
- Region: Cambridge
Financial & listing details
- Lease term: 12 Months
Price history
| Date | Event | Price |
|---|---|---|
| 7/24/2026 | Price change | $6,629-1.1%$5/sqft |
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| 7/22/2026 | Price change | $6,704-2.2%$5/sqft |
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| 7/18/2026 | Listed for rent | $6,854+1.9%$5/sqft |
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| 4/13/2025 | Listing removed | $6,727$5/sqft |
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| 4/1/2025 | Listed for rent | $6,727+12.8%$5/sqft |
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| 10/25/2024 | Listing removed | $5,965$5/sqft |
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| 10/23/2024 | Price change | $5,965-10.9%$5/sqft |
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| 10/21/2024 | Price change | $6,696-4.3%$5/sqft |
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| 10/17/2024 | Listed for rent | $6,996+16.6%$5/sqft |
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| 12/10/2023 | Listing removed | -- |
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| 12/6/2023 | Price change | $5,999-1.6%$5/sqft |
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| 11/20/2023 | Price change | $6,099-8.7%$5/sqft |
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| 11/18/2023 | Price change | $6,677+9.5%$5/sqft |
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| 10/16/2023 | Price change | $6,099+1.7%$5/sqft |
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| 9/5/2023 | Price change | $5,999-3.2%$5/sqft |
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| 8/24/2023 | Price change | $6,199+1.6%$5/sqft |
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| 8/15/2023 | Listed for rent | $6,099-1.6%$5/sqft |
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| 9/4/2022 | Listing removed | -- |
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| 8/10/2022 | Price change | $6,199-3.1%$5/sqft |
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| 7/1/2022 | Price change | $6,399-1.2%$5/sqft |
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| 6/29/2022 | Price change | $6,474-3%$5/sqft |
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| 6/22/2022 | Price change | $6,674-1.5%$5/sqft |
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| 6/20/2022 | Price change | $6,774+3%$5/sqft |
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| 6/16/2022 | Price change | $6,574-1.5%$5/sqft |
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| 4/29/2022 | Listed for rent | $6,674$5/sqft |
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Neighborhood: East Cambridge
Nearby schools
GreatSchools rating
- 5/10Kennedy-Longfellow SchoolGrades: PK-5Distance: 0.4 mi
- 8/10Vassal Lane Upper SchoolGrades: 6-8Distance: 0.5 mi
- 8/10Cambridge Rindge and Latin SchoolGrades: 9-12Distance: 1.8 mi
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There are 7 available units in this apartment building