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MLS ID KEY1057129Last updated Oct 1, 2026

Single Family

517A Old Chappaqua Road

Active · Mount Pleasant · Westchester County, NY 10510

Bedrooms
5 Beds
Bathrooms
5 Baths
Year built
2026
Est. monthly taxes
$5,660.33
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About this home

Exquisite new 5 bedroom, 4.1 bath center hall colonial to be built offering refined luxury and timeless architectural elegance in an exceptional cul-de-sac setting. Perfectly positioned on just shy of one acre and backing the serene wooded grounds of the Edith Macy Center, this residence blends privacy, prestige, and natural beauty. A rare opportunity exists to fully customize finishes, materials, colors, and upgrades — allowing you to curate a home that reflects your personal vision and lifestyle. Upon entry, a dramatic double-sided staircase with an architectural catwalk creates a breathtaking focal point. Thoughtfully designed with 9-foot ceilings throughout and a soaring 20-foot cathedral ceiling in the family room, the home offers grand scale and open, light-filled living spaces. A statement fireplace anchors the family room, creating warmth and sophistication. The state-of-the-art chef’s kitchen will feature premium appliances, custom cabinetry, quartz countertops, and expansive workspace ideal for entertaining and everyday luxury living. Upstairs, generously proportioned bedrooms provide comfort and privacy, with the option to finish a bonus room tailored to your needs — whether a media lounge, private office, or fitness studio. The primary suite will serve as a tranquil retreat with spa-inspired bath potential. Additional exceptional features include: 3-car garage, expansive rear patio for seamless indoor/outdoor entertaining, large unfinished lower level, plumbed for future bath and endless possibilities, pool site potential in the rear yard. The home will be strategically set back and elevated on the property to maximize privacy, presence, and curb appeal. Driveway will be completely redone and re-pitched. House is currently staked out in yellow. Taxes are projected based on list price and consolidated tax rate and do not include STAR discount. A rare opportunity to build a luxury residence in a coveted location. Customize now and bring your dream home to life.

Listing snapshot

Days on site
28 days
Listed on MLS
Sep 30, 2026
Full baths
4
Half baths
1
Annual property tax (MLS)
$67,924
Tax year
2026
Area source (MLS)
Other
Listing brokerage
Mark Seiden Real Estate Team
MLS ID
KEY1057129
Last updated
Oct 1, 2026

General features

Property type
Single Family
Property subtype
Single Family Residence
Year built
2026
Garage
Yes
Garage spaces
3
Parking
Attached
Water source
Well
Sewer
Public Sewer
Utilities
Electricity Connected, Sewer Connected, Trash Collection Public

Interior features

Basement
Unfinished
Heating
Electric
Cooling
Central Air
Interior
Breakfast Bar, Cathedral Ceiling(s), Chefs Kitchen, Crown Molding, Eat-in Kitchen, High Ceilings, His and Hers Closets, Kitchen Island, Pantry, Primary Bathroom, Quartz/Quartzite Counters, Recessed Lighting, Soaking Tub, Walk-In Closet(s)
Appliances
Dryer, Stainless Steel Appliance(s), Washer
Flooring
Hardwood
Fireplace
Yes
Fireplaces
1

Exterior features

Architectural style
Colonial
Construction materials
HardiPlank Type
Private pool
No

Schools (MLS)

Elementary school
Todd Elementary School
Elementary school district
Briarcliff Manor
Middle school
Briarcliff Middle School
Middle school district
Briarcliff Manor
High school
Briarcliff High School
High school district
Briarcliff Manor

School information is provided by the MLS. Confirm attendance eligibility with the school district.

Recent activity

  1. Listing updated from MLS
  2. First seen on this site
  3. MLS status changed

Location

Mount Pleasant · Westchester County, NY 10510Show interactive map
517A Old Chappaqua Road

Mount Pleasant · Westchester County, NY 10510

Google Maps directions

Estimate monthly payment

Loan detailsFixed-rate, fully amortizing loan. Edit the assumptions below; no market rate is supplied.
Property expenses (USD)
MLS amounts are prefilled when available and can be edited. Confirm what fees include. Unknown fee frequencies cannot be converted automatically.Property expenses: MLS values where available; missing values stay blank.

Estimated monthly principal & interest—

Monthly property taxNot provided

Monthly association / maintenance feesNot provided

Estimated monthly total of entered costs—

Excludes insurance, mortgage insurance, special assessments and lender fees. MLS taxes may reflect abatements or exemptions and can change.

Listing data is supplied by the MLS and may change without notice.