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Justin Sieczkowski | Colliers | Phoenix

Justin Sieczkowski

Associate Vice President

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Professional Summary

As an associate vice president with Colliers, Justin Sieczkowski specializes in the sale and lease of industrial facilities; land sales to developers and users; build-to-suit facilities for sale or lease; and the sale of single and multi-tenant industrial facilities (investment properties).

He is a member of the top-producing industrial team of Paul Sieczkowski, senior executive vice president, who has over 36 years of experience in the Phoenix area; and Mallory Wayne, associate.

Throughout the property marketing, negotiation and transaction process, Justin facilitates sales and leases that are beneficial to the team’s clients. He focuses on helping clients achieve their commercial real estate objectives, monitoring current market conditions, and keeping clients fully informed about trends that impact their real estate decisions.

Clients benefit from Justin’s skills in sales, customer relationship management, strategic planning, communications and targeted prospecting. He is committed to providing quality service and building long-term relationships.

Previously, Justin served as a research associate for Colliers for the Arizona region. In that role, he compiled market statistics for each property type, maintained sales and lease comp databases, monitored tenant activity, and conducted industry research using various in-house and on-line resources.

Prior to joining Colliers, Justin was a corporate account executive at CDW, a leading multi-brand technology solutions provider. Responsibilities included prospecting new business, processing technology quotes and orders, and growing a book of business across the Southwest region.


  • 2019 – Named Rookie of the Year by Colliers in Arizona
  • 2019 - Nominated as NAIOP Rookie Broker of the Year
  • Valley Partnership Advocate 2017-2018


  • Bachelor of Science, Marketing, Northern Arizona University

Memberships & Involvements

  • NAIOP Developing Leaders, the Commercial Real Estate Development Association
  • CCIM Continuing Education
  • Brokers for Kids, a fundraiser to benefit Boys Hope Girls Hope
  • Colliers Holiday Adopt-a-Family
  • Colliers AZ Cares, a charitable foundation that supports the local community


  • The Rockefeller Group Development Corporation
  • EastGroup Properties
  • Intertek
  • Clack Corporation



Land Sales, Distribution, Warehouses

Service Lines

Landlord Representation, Tenant Representation, Capital Markets

Property Type

Industrial, Land

My Team

Featured Research

Jan 26, 2023

2022 Q4 Greater Phoenix Industrial Report

The fourth quarter outperformed the previous quarter despite the looming fear of a recession. The Phoenix Industrial market has positioned itself with positive momentum.
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Jul 22, 2022

2022 Q2 Greater Phoenix Industrial Market Report

Despite the economic headwinds that are feared in the US economy, the Phoenix MSA is showing and extremely healthy performance.
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Featured News

Nov 8, 2022

Construction of Phoenix industrial space hits 40.9M square feet

The amount of industrial space under construction in Greater Phoenix indicates the furious pace that developers have taken to satisfy historic demand in the marketplace.
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Jul 29, 2022

Greater Phoenix Industrial Market posts historic quarter

Vacancy falls to 2.6 percent with 35.2 million square feet under construction
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