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Justin Sieczkowski | Colliers | Phoenix

Justin Sieczkowski

Senior Associate

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Professional Summary

As a senior associate 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

Service Lines

Landlord Representation, Tenant Representation, Capital Markets

Property Type

Industrial, Land

My Team

Featured Research

Apr 16, 2021

2021 Q1 Greater Phoenix Industrial Market Report

The Greater Phoenix industrial market for Q1 2021 saw rental rates continue to climb, increasing over 8% year-over-year. Vacancy decreased 80 bps over-the-quarter, while delivering 2.9 MSF, illustrating very strong tenant activity. Product under construction has reach an all-time high and more is in the pipeline.
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Jan 15, 2021

2020 Q4 Greater Phoenix Industrial Market Report

The Greater Phoenix industrial market ended the year with the highest YTD absorption ever witnessed at 13.9 MSF, with net absorption exceeding 7 MSF in the fourth quarter. Under construction decreased 2.2 MSF feet from third quarter to 7 MSF. We delivered 6.5 MSF of new product in Q4.
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Oct 13, 2020

2020 Q3 Greater Phoenix Industrial Market Report

Greater Phoenix industrial net absorption topped over 2.5 MSF in 3rd quarter. Under construction decreased 2.4 MSF from 2nd quarter to 9.2 MSF. Vacancy increased over-the-quarter by 10 bps and over-the-year vacancy increased only 80 bps to 7.9%. Rents increased 6.6% over-the-year and 0.15% over-the-quarter to $0.61 PSF.
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Featured News

Apr 20, 2021

Construction of industrial space in Phoenix hits record levels

The Greater Phoenix industrial real estate market maintained a record-breaking pace during first quarter of 2021, according to Colliers’ first quarter report. Construction activity reached an all-time high level, while momentum of net absorption indicates this year will easily outperform 2020.
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Jan 19, 2021

2020 marks best year for industrial market in Phoenix history

The Greater Phoenix industrial market posted 13.9 MSF net absorption in 2020, the largest in its history, of which 7 MSF were absorbed in Q4. A remarkable 6.5 MSF of new industrial space came online in Q4. Direct vacancy dropped to 7.4%. Land sales of 10-plus acre parcels soared to its highest volume since 2015.
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