Flats on First

📍 21 Charles Street, Cambridge, MA 02141

📋 Property Overview

A home in East Cambridge, Cambridge, Massachusetts with Studio - 3 bd and 1 ba. The floor plan measures 439 sq ft. Rents run from $2,840 to $5,965 a month. The unit features microwave, dishwasher, in unit laundry and stainless steel. On site there is pet friendly, fire pit, package receiving and garage. Pets are allowed (cats and dogs), with pet rent of $85. Residents have access to garage. Leases run 12 months. Availability: Available now. Included in the rent: trash. The Walk Score here is 97, meaning most errands can be done on foot. Transit Score is 87. Rent sits 18% below the area median ($3,450).

🚶 Getting Around

• Walk Score97/100

  Walker's Paradise

• Transit Score87/100

  Excellent Transit

💵 Costs & Lease

Deposit

$450

Lease length

12 months

Units available

7 units

Amounts are as published by the source and may change. Confirm before applying.

📐 Floor Plan Details

• A7H1 bd · 1 ba · 767 sq ftNone available right now
• A101 bd · 1 ba · 1,101 sq ftNone available right now
• A51 bd · 1 ba · 897 sq ftNone available right now
• C13 bd · 2 ba · 1,303 sq ft$5,9651 unit available
• B12 bd · 2 ba · 977 sq ftNone available right now
• B22 bd · 2 ba · 1,149 sq ftNone available right now
• S1Studio · 1 ba · 439 sq ft$2,8401 unit available
• B82 bd · 2 ba · 1,221 sq ftNone available right now
• S2Studio · 1 ba · 584 sq ftNone available right now
• A71 bd · 1 ba · 757 sq ft$3,5703 units available
• S1AStudio · 1 ba · 440 sq ftNone available right now
• S3Studio · 1 ba · 627 sq ftNone available right now

🧾 Move-in Costs & Lease

Security deposit

$450

Lease length

12 months

Also available

13 months

Lease options

13 months

Available

Available now

Application fee

$60 per applicant, paid to RivoRent

Property amounts are as published by the source and may change. Confirm before applying. The application fee is RivoRent's own and is the same on every listing.

🛡️ Renters Insurance — Estimated Cost

Based on what Massachusetts renters actually paid: NAIC industry data for 2023 (average HO-4 premium, 452,865 policy-years), adjusted to July 2026 with the U.S. Bureau of Labor Statistics tenants' insurance index. It is a market average, not a price for this building and not a price for you.

Your own price depends most on your credit-based insurance score, your claims history and which carrier you choose. In published Ohio figures the same coverage ranges from $127 a year at excellent credit to $933 at poor credit. We do not ask for any of that, so we cannot narrow this for you.

💡 Utilities Included

• Trash

✅ Who Qualifies

Must have 3x the rent in total household income (before taxes)

🐾 Pets

Pets

Allowed

Types

Cats, Dogs

Pet rent

$85

Limit

2 pets

Restrictions

100 Ib combined weight limit; Breed Restrictions Apply

✨ Features & Details

• Pet Friendly
• In unit laundry
• Patio / balcony
• Dishwasher
• 24hr maintenance
• Garage
• Walk in closets
• Stainless steel
• Air conditioning
• Bathtub
• Carpet
• Garbage disposal
• Ice maker
• Microwave
• Oven
• Range
• Refrigerator
• Smoke-free units
• Clubhouse
• Courtyard
• Fire pit
• 24hr gym
• Game room
• Parking
• Bbq/grill
• Bike storage
• Internet access
• Media room
• Package receiving
• Cats allowed
• Dogs allowed
• Accessible
• Elevator
• Business center
• CC payments
• Lobby
• Online portal
• Smoke-free community
• 1303 sq ft
• 439 sq ft
• 767 sq ft
• 764 sq ft
• 909 sq ft
• 1050 sq ft

📊 Property Facts

Walk Score

97 · Walker's Paradise

Transit Score

87 · Excellent Transit

🚗 Parking

• Garage

🎓 Nearby Schools

• Community Charter School of Cambridge · 6-127/10 · 0.3 mi
• Kennedy-Longfellow School · PK-53/10 · 0.5 mi
• Fletcher/Maynard Academy · PK-55/10 · 0.9 mi
• Clarence R Edwards Middle School · 6-81/10 · 1.0 mi
• Cambridgeport · PK-55/10 · 1.0 mi
• Warren-Prescott K-8 School · PK-86/10 · 1.0 mi
• Prospect Hill Academy Charter School · K-125/10 · 1.1 mi
• Snowden Int'L High School · 9-122/10 · 1.2 mi
• Harvard-Kent Elementary School · PK-54/10 · 1.2 mi
• Charlestown High School · 9-122/10 · 1.2 mi

🏡 Floor Plans

421B

1,303 sq ft · 12 mo

Available now

$5,965

205B

439 sq ft · 12 mo

Oct 29, 2026

$2,840

520B

767 sq ft · 13 mo

Available now

$3,570

609B

764 sq ft · 12 mo

Oct 25, 2026

$3,570

418B

767 sq ft · 13 mo

Sep 18, 2026

$3,570

507B

909 sq ft · 12 mo

Nov 24, 2026

$4,450