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Just off iconic Chestnut Street, this exceptional Beacon Hill maisonette offers the rare combination of a private entrance, landscaped garden, and secluded patio in the coveted South Slope. Rich in architectural detail and filled with natural light from abundant windows and skylights, this elegant duplex lives like a private townhouse. The fireplaced living room opens to the private terrace, while the beautifully updated kitchen features stone countertops, custom cabinetry, and stainless appliances. A spacious den overlooking the garden provides an ideal home office or dining area. Upstairs are two generous skylit bedrooms, including a tranquil primary suite with large closets and a marble bath with radiant heated floors. Hardwood floors, Miele washer/dryer, air conditioning, and deeded storage complete this rare offering, just moments from Boston Common, the Public Garden, the Esplanade and all the shops and restaurants along Charles St.

  • Bedrooms
    2
  • Bathrooms
    2
  • Year Built
    1875
  • Stories
    2.0
  • Construction Materials
    Brick
  • Parking Features
    On Street
  • Living Area
    1038.0
  • Interior Features
    Entrance Foyer
  • Exterior Features
    Garden, Courtyard
  • Patio And Porch
    Patio, Enclosed
  • Cooling
    Heat Pump, Zoned
  • Heating
    Baseboard, Heat Pump

  • Acres
    0.02
  • Water
    Public


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Frequently Asked Questions

How do I schedule a tour of 21 Walnut M?

We can make that happen quickly. Click Tour This Home and we'll connect you directly with our vetted local partner to schedule your visit to 21 Walnut M.

They know residentials in the area well and can give you the guidance you need to buy with confidence.

How do I get more information about 21 Walnut M?

Click Ask a Question to talk with our team. You already know it is a 2 bed, 2 bath, listed for $1,695,000. We can talk through recent upgrades, potential seller motivation, how this condominium compares to others in Boston, and can even get you in to see the property quickly.

How much is the monthly mortgage payment for 21 Walnut M?

With a 20% down payment and a 30-year fixed loan at an illustrative 7.25% rate, the ez Mortgage Calculator estimates the monthly payment for 21 Walnut M at around $11,053. This includes estimated property taxes and insurance.

Want to see how this changes with different down payments or interest rates? Jump to the calculator to run the numbers and fine-tune your plan.

How do I get pre-approved to buy 21 Walnut M?

Stand out in a competitive market by getting pre-approved today. Our quick and private pre-approval process helps you understand your true buying power—no credit pull required to explore all of your options.

Or, let us connect you with our preferred local lender in Suffolk County. They will give you all of your available financing options, based on your specific situation and what is available to you.

Can I negotiate the asking price for 21 Walnut M?

In most cases, yes. Whether 21 Walnut M is priced competitively or not, your best offer depends on your personal situation, the seller's timeline, and recent activity in Boston's market. Our preferred local partner will help you craft a strategy—factoring in comparable properties that have sold, timing, and deal structure—to make a smart, strong offer. Click here to ask about negotiation opportunities.

How do I make an offer on 21 Walnut M?

We can handle that for you. Our preferred local agent specializes in residentials in Boston and can guide you through every step of the offer process.

You need an expert who is looking out for your best interests. From market valuation to contingencies and timing, they'll help you present a compelling offer that fits your goals. Click Ask a Question to get started today.

What is the price per square foot for this home?

This home is listed at $1,695,000 with 1,038 sqft of space—that comes out to approximately $1,633 per square foot.

How long has this property been on the market?

21 Walnut M was listed on July 14, 2026, which means it's been on the market for 120 days.

Want to keep tabs on it? Click the ♥ to favorite this home and get notified of price drops or changes.

When was this house built?

This home was built in 1875, making it approximately 151 years old.

What is the lot size of this property?

21 Walnut M sits on a 0.02-acre lot, which is 871 square feet.

What are the property taxes for 21 Walnut M?

The most recent public record shows annual property taxes for 21 Walnut M were approximately $16,885. This may change with reassessment or exemptions. Our local partner can verify current tax amounts and help you estimate future costs based on your situation.

Is there an HOA fee for this property, and what does it cover?

This home has an HOA fee of $1,001 paid monthly.

This covers access to community features including: Hot Water.

Is 21 Walnut M still available for sale?

This home is under contract, but may still accept backup offers. Click ♥ to track updates or connect with our local expert to see if it's still worth pursuing.

Source: ez Home Search, MLS Data

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Listing information provided exclusively for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Information deemed reliable but not guaranteed by the MLS. The listing broker’s offer of compensation is made only to participants of the MLS where the listing is filed. Copyright 2026, MLS Property Information Network (MLS PIN). All rights reserved.

Last Updated: November 11, 2026 at 04:32PM | Source: MLS Property Information Network (MLS PIN) | MLS#: 73549276