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MLS ID KEY1054921Last updated Oct 25, 2026

Single Family

421 Union Avenue

Active · Mount Vernon · Westchester County, NY 10550

Bedrooms
3 Beds
Bathrooms
2 Baths
Year built
1921
Est. monthly taxes
$859.33
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About this home

Charming and full of character, this inviting home offers a wonderful blend of classic details, comfortable living spaces, and a beautifully open outdoor setting. The front exterior creates an appealing first impression with its gabled roofline, welcoming entry, mature landscaping, and a broad front window that brings natural light into the home. A large tree and neatly maintained lawn add to the established feel, while the front walkway leads to a covered entry that feels warm and approachable. One of the standout features is the enclosed front porch or sunroom, a bright transitional space with abundant windows, rich wood flooring, a wood ceiling, and a hanging light fixture that enhances the home's timeless personality. This area provides a pleasant spot to enjoy morning light, set up a reading nook, or create an additional sitting space. From there, French doors open into the main living area, where natural light, tall ceilings, and dark wood floors create a comfortable atmosphere with a classic look. The living room offers a spacious central gathering area with multiple windows, ceiling fan lighting, and an easy flow into adjacent rooms. French doors add visual interest and separation while still keeping the layout open and connected. Just beyond, the dining room is generous in length and well suited for everyday meals, larger gatherings, or a flexible combination of dining and workspace needs. Large windows brighten the room, and the continued wood flooring helps tie the main level together. The kitchen presents a stylish contrast of dark cabinetry, light countertops, and a mosaic tile backsplash. Recessed lighting and a window above the sink add brightness, while the layout provides good cabinet storage and practical work areas. An adjoining breakfast nook or casual dining corner is surrounded by windows, creating a cheerful place for coffee, meals, or extra prep space. The bedroom shown is filled with natural light and features wood flooring, multiple windows, and a simple, comfortable layout that feels airy and efficient. The bathroom has been updated with clean finishes, including a modern vanity, bright wall tile detail, and a window that adds natural light and ventilation. Outside, the backyard is a major highlight. The lot opens to a large lawn framed by mature trees and established hedges, offering a peaceful backdrop and a sense of openness. A substantial paved area provides room for outdoor seating, entertaining, or other uses, while the expansive green space offers flexibility for recreation, gardening, or simply enjoying the setting. The deep yard and surrounding greenery make this outdoor area especially memorable. Throughout the home, the combination of classic architectural touches, bright windows, wood flooring, and updated kitchen and bath spaces creates an appealing opportunity for someone looking for character and functionality in one property. This home offers inviting indoor spaces, a welcoming front presence, and an exceptional backyard that adds meaningful room to spread out and enjoy the outdoors.

Listing snapshot

Days on site
34 days
Listed on MLS
Sep 24, 2026
Full baths
1
Half baths
1
Annual property tax (MLS)
$10,312
Tax year
2026
Area source (MLS)
Public Records
Listing brokerage
Prominent Properties Sotheby's
MLS ID
KEY1054921
Last updated
Oct 25, 2026

General features

Property type
Single Family
Property subtype
Single Family Residence
Year built
1921
Garage
No
Parking
On Street
Water source
Public
Sewer
Public Sewer
Utilities
Electricity Available

Interior features

Basement
Full
Heating
Other
Cooling
Ductless
Interior
First Floor Bedroom
Appliances
Refrigerator, Oven, Range

Exterior features

Architectural style
A-Frame
Construction materials
Stucco
Private pool
No

Schools (MLS)

Elementary school
Edward Williams
Elementary school district
Mount Vernon
Middle school
Benjamin Turner Middle School
Middle school district
Mount Vernon
High school
Mt Vernon High School
High school district
Mount Vernon

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 Vernon · Westchester County, NY 10550Show interactive map
421 Union Avenue

Mount Vernon · Westchester County, NY 10550

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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.