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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 34 years of experience in the Phoenix area; and Mallory Wayne, associate.

Throughout the property marketing, negotiation and transaction process, Jason 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

Apr 13, 2022

2022 Q1 Greater Phoenix Industrial Market Report

The Phoenix industrial market consistently performs better each quarter. Strong demand for industrial space compressed vacancy to the lowest level ever witnessed in the market.
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Jan 19, 2022

2021 Q4 Greater Phoenix Industrial Market Report

During the fourth quarter, the Phoenix Industrial market broke multiple barriers, which is elevating the market into a hyper competitive market.
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Oct 8, 2021

2021 Q3 Greater Phoenix Industrial Market Report

At the end of the third quarter there were 20 million square feet under construction, setting yet another high point for the market.
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Featured News

Apr 18, 2022

Phoenix industrial market continues setting records

Greater Phoenix posted its strongest industrial market conditions during first quarter 2022. Vacancy fell to a historic low level of 4.0 percent during the first three months.
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Jan 20, 2022

Phoenix Industrial Market sets all-time records in 2021

The Metro Phoenix industrial market set a series of records in 2021, making it the most active year in the area’s history.
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