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421 Union AvenueMount Vernon, NY 10550

For Sale

$570,000

Smart Buyer Rebate $1,750

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.

Listed by Dominique Freeman

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Prominent Properties Sotheby's

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201-768-9300

Last updated October 25, 2026

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Source: OneKey #1054921

Listing Facts

  • TypeSingle-family
  • NeighborhoodSouth Side
  • Bedrooms3
  • Bathrooms2
  • Days on Prevu37
  • Taxes$10,312/year
  • Size5,227 sqft
  • Price per sqft$109

Location

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Listing History

09/24/2026
Listed by Prominent Properties Sotheby's
$570,000
  1. 09/24/2026$570,000
    Listed by Prominent Properties Sotheby's

Property Details for 421 Union Avenue

Exterior

Construction

  • Year Built: 1921
  • Architectural Style: A-Frame
  • Construction Materials: Stucco

Measurements

  • Building Area Units: Square Feet
  • Lot Size Acres: 0.12
  • Lot Size Square Feet: 5,227

Financial

Taxes

  • Parcel Number: 550800 169.31-3144-25
  • Tax Annual Amount: $10,312.00
  • Tax Assessed Value: $6,000.00
  • Tax Year: 2026

Interior

Features

  • Appliances: Refrigerator, Oven, Range
  • Interior Features: First Floor Bedroom

Measurements

  • Living Area: 5,227
  • Living Area Source: Public Records

Rooms

  • Basement: Full
  • Has Basement: Yes
  • Bathrooms Full: 1
  • Bathrooms Half: 1
  • Bathrooms Total Integer: 2
  • Bedrooms Total: 3
  • Rooms Total: 7

Other

Location

  • Tax Block: 3144
  • Tax Lot: 25.000

Parking

Parking

  • Parking Features: On Street

Schools

Elementary School

  • Elementary School: Edward Williams
  • Elementary School District: Mount Vernon

High School

  • High School: Mt Vernon High School
  • High School District: Mount Vernon

Middle or Junior School

  • Middle Or Junior School: Benjamin Turner Middle School
  • Middle Or Junior School District: Mount Vernon

Utilities

Equipment

  • Cooling: Ductless
  • Heating: Other
  • Sewer: Public Sewer
  • Utilities: Electricity Available
  • Water Source: Public

Frequently Asked Questions

How many bedrooms and bathrooms does this single-family home have?

There are 3 bedrooms and 2 bathrooms in this single-family home at 421 Union Avenue.

What schools are nearby to 421 Union Avenue?

Nearby schools include the Edward Williams Elementary School, Benjamin Turner Middle School, and Mt Vernon High School.

What are the annual taxes for 421 Union Avenue?

Annual taxes for this single-family home are estimated at $10,312.

How does 421 Union Avenue compare to other single-family homes in South Side?

This single-family home is listed 11% below the average price for single-family homes in South Side and has been on the market for 53 less days than the typical home in this area.

What is the square footage on this single-family home?

According to the MLS, this listing is 5,227 sqft.

421 Union Avenue is a 3-bedroom, 2-bath single-family home for sale in Mount Vernon NY 10550. On Prevu for 37 days at $570,000. This property features 5,227 square feet of living space, located in South Side. The median listing price for single-family homes in this area is $699,999. Nearby schools include Edward Williams Elementary School, Benjamin Turner Middle School, and Mt Vernon High School. Explore more single-family home listings in Mount Vernon.

The data relating to real estate for sale on this website comes in part from the IDX Program of OneKey™ MLS. The source of the displayed data is either the property owner or public record provided by non-governmental third parties. It is believed to be reliable but not guaranteed. This information is provided exclusively for consumers’ personal, non-commercial use. Information Copyright 2026, OneKey™ MLS. All Rights Reserved.

Full MLS Disclaimers

Rebate estimate is indicative only and based on listing price and estimated buyer's agent commission paid by owner, if applicable. Final rebates are subject to Terms of Use and may vary due to final negotiated transaction terms.