Verified Healthy Building


Vanderbilt Office Properties

Verify ID:


Expiration date:

September 22, 2022 - September 21, 2023

Verification Mark

Facility Information

The Towers at Williams Square, 5221, 5201, 5205, 5215 North O'Connor Blvd, Irving, TX 75039 

Applicable To:

See Address Above

Marketing Claim Verified by UL Solutions

Verified Healthy Building for Indoor Air and Water

Verification Method

UL’s Healthy Buildings Verification Mark for Indoor Air and Water demonstrates that indoor spaces provide healthy indoor air quality (IAQ). It shows a commitment by building owners and managers to create and maintain indoor environments that support tenant health, well-being and comfort, backed by UL’s globally recognized expertise in IAQ and building health. These buildings meet rigorous performance criteria and have policies and plans in place for continual advancement of IAQ. To achieve the UL Healthy Buildings Verification Mark, spaces underwent a desktop audit and on-site visits that include visual inspections and performance testing to evaluate a range of building conditions. The program includes an annual comprehensive assessment coupled with surveillance at the mid-year point. The IAQ testing requirements verify that the building air and water meets rigorous standards. These standards are aligned with industry-recognized, third-party organizations such as the Environmental Protection Agency (EPA), the National Institute for Occupational Safety and Health (NIOSH), the World Health Organization (WHO) and the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), among others. When necessary, all laboratory testing and analysis methodologies are informed by the EPA Compendium of Methods, ASTM D5197 and TO-17 for air sampling, and EPA methods.

About the Company

Williams Square is the premier epicenter of walkability in the heart of Las Colinas. The four-building, high-end property totals 1.4 million square feet. Comprehensive interior and exterior renovations are underway. The recognizable bronze Mustangs of Las Colinas are the centerpiece of Williams Square. Construction on $7.8 million of renovations has finally been completed, bringing ample green space, seating, and dining options to the plaza. Williams Square is positioned between the Music Factory, Las Colinas’ newest entertainment destination, and Water Street, the recently opened multi-use complex offering waterfront apartments, shopping, and dining.

What is UL Verification?

UL Verification is an objective, science-based assessment that confirms the accuracy of marketing claims. Our independent assessment process scrutinizes the validity of specific advertising or promotional statements, giving you a way to separate verified fact from fiction.