For sale

Price cut: $10K (7/15)

$569,900

500 Union St #5404, Westborough, MA 01581

2beds

1,423sqft

$4,432/mo

Get pre-qualified

Condominium

Built in 2007

-- sqft lot

$563,200 Zestimate^®

$400/sqft

$471/mo HOA

What's special

Central air conditioningSeparate showerIn-unit laundrySunlit open-concept gemWarm and inviting atmosphereEn-suite bathroomFlexible den

Step into your dream penthouse in the lively Bay State Commons of downtown Westborough! This sunlit, open-concept gem features 2 bedrooms, a flexible den, and 2 full baths, offering the perfect blend of comfort and style. Enjoy the ease of central air conditioning and in-unit laundry, plus the luxury of 2 private parking spaces. With soaring ceilings and expansive east-facing windows, this space is awash in morning light, creating a warm and inviting atmosphere. The primary suite is a serene escape, complete with two closets and an en-suite bathroom featuring a relaxing soaking tub and separate shower. As part of a professionally managed elevator building, you’ll be steps away from local favorites like Roche Bros., Panera Bread, and Ted’s Montana Grill. With downtown dining, the public library, and Westborough High School just around the corner, convenience is at your doorstep. Plus, enjoy the beautiful Bay State Green park right across the street, perfect for relaxation and play.

129 days
391
7

Facts & features

Interior

Bedrooms & bathrooms

Bedrooms: 2
Bathrooms: 2
Full bathrooms: 2

Primary bedroom

Level: Fourth Floor

Bedroom 2

Level: Fourth Floor

Primary bathroom

Features: Yes

Bathroom 1

Level: Fourth Floor

Bathroom 2

Level: Fourth Floor

Dining room

Level: Fourth Floor

Kitchen

Level: Fourth Floor

Living room

Level: Fourth Floor

Heating

Central, Forced Air, Natural Gas

Cooling

Central Air

Appliances

Included: Range, Dishwasher, Microwave, Refrigerator, Washer, Dryer
Laundry: Fourth Floor, In Unit, Electric Dryer Hookup

Features

Den
Flooring: Wood, Tile, Carpet
Windows: Insulated Windows
Has basement: No
Has fireplace: No

Interior area

Total structure area: 1,423
Total interior livable area: 1,423 sqft
Finished area above ground: 1,423

Property

Parking

Total spaces: 2
Parking features: Attached, Deeded, Off Street
Attached garage spaces: 1
Uncovered spaces: 1

Accessibility

Accessibility features: Accessible Entrance

Details

Parcel number: 4773714
Zoning: IND

Construction

Type & style

Home type: Condo
Property subtype: Condominium
Attached to another structure: Yes

Materials

Frame, Brick

Condition

Year built: 2007

Utilities & green energy

Sewer: Public Sewer
Water: Public
Utilities for property: for Electric Range, for Electric Dryer

Community & HOA

Community

Features: Public Transportation, Shopping, Tennis Court(s), Park, Golf, Conservation Area, Highway Access, Public School, Other
Security: Intercom

HOA

Amenities included: Elevator(s)
Services included: Water, Sewer, Insurance, Maintenance Structure, Maintenance Grounds, Snow Removal, Reserve Funds
HOA fee: $471 monthly

Location

Region: Westborough

Financial & listing details

Price per square foot: $400/sqft
Tax assessed value: $470,300
Annual tax amount: $7,661
Date on market: 4/28/2026

Estimated market value

$563,200

$535,000 - $591,000

$2,740/mo

Price history

Date	Event	Price
7/15/2026	Price change	$569,900-1.7%$400/sqft
Source: MLS PIN #73508590 Report a problem
6/10/2026	Price change	$579,900-0.9%$408/sqft
Source: MLS PIN #73508590 Report a problem
5/27/2026	Price change	$585,000-0.8%$411/sqft
Source: MLS PIN #73508590 Report a problem
4/28/2026	Listed for sale	$589,900+5.3%$415/sqft
Source: MLS PIN #73508590 Report a problem
5/22/2025	Sold	$560,000+3.7%$394/sqft
Source: MLS PIN #73362967 Report a problem
5/2/2025	Pending sale	$540,000$379/sqft
Source: BHHS broker feed #73362967 Report a problem
4/23/2025	Listed for sale	$540,000+64.4%$379/sqft
Source: MLS PIN #73362967 Report a problem
3/31/2015	Sold	$328,500+16.3%$231/sqft
Source: Public Record Report a problem
9/10/2010	Sold	$282,500+18.2%$199/sqft
Source: Public Record Report a problem
3/5/2009	Sold	$239,000$168/sqft
Source: Public Record Report a problem

Public tax history

Year	Property taxes	Tax assessment
2025	$7,661 +3.4%	$470,300 +4.1%
2024	$7,411 +0.6%	$451,600 +3.2%
2023	$7,366 -1.5%	$437,400 +8.2%
2022	$7,476 +3.8%	$404,300 +4.1%
2021	$7,203 +21.8%	$388,500 +20.4%
2020	$5,914 -3.7%	$322,800 -3.6%
2019	$6,139 +8.3%	$334,900 +9%
2018	$5,671 -4.8%	$307,200 -8.2%
2017	$5,958 +11.7%	$334,700 +11.5%
2016	$5,336 +1.5%	$300,300 +6.2%
2015	$5,255 -3.6%	$282,700
2014	$5,453 +1.7%	$282,700
2013	$5,363 +8%	$282,700 +9.4%
2012	$4,966 +5.3%	$258,500
2011	$4,715	$258,500