Justin Sieczkowski

Justin Sieczkowski

Senior Associate

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Professional Summary

As a senior associate with Colliers International, I specialize in the sale and lease of single- and multi-tenant industrial properties; land sales to users and developers; and the sale and lease of build-to-suit facilities. I partner with Paul Sieczkowski, executive vice president. Our team focuses primarily on the Southeast Valley industrial market, representing landlords, investors and tenants.

Throughout the property marketing, negotiation and transaction process, I facilitate sales and leases that are beneficial to our clients. I am focused on helping clients achieve their commercial real estate objectives. Monitoring current market conditions, I keep our clients fully informed about trends that impact their real estate decisions.

Clients benefit from my skills in sales, customer relationship management, strategic planning, communications and targeted prospecting. I am committed to providing quality service and building long-term client relationships.

Previously, I served as a research associate for Colliers for the Greater Phoenix market. In that role, I 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, I 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 International | Arizona
  • Valley Partnership Advocate 2017-2018


  • Bachelor of Science, Marketing, Northern Arizona University

Memberships & Involvements

  • NAIOP Developing Leaders, the Commercial Real Estate Development Association
  • 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
Property Types
Industrial, Land

My Team

My Team

Featured Research
Feb 11, 2020
2019 Q4 Greater Phoenix Industrial Market Report
Greater Phoenix industrial net absorption was 1.64 million in Q4 and over 5 million for all of 2019. Projects under construction increased to 10.5 million square feet, from Q2’s high of 8.9 million, with rents up 5.1 percent over-the-year to $0.59 per square foot.
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Oct 11, 2019
2019 Q3 Greater Phoenix Industrial Market Report
The Greater Phoenix industrial market reports net absorption of 1.23 MSF in the third quarter and just over 3 MSF for all of 2019. Under construction projects also decreased to 7.9 MSF from Q2’s high of 8.9 MSF, with rents up 3.6 percent over-the-year to $0.57 per square foot.
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Jul 18, 2019
2019 Q2 Greater Phoenix Industrial Market Report
Colliers International reports net absorption, which was 550,000 in the first quarter, increased to approximately 1.4 million by the end of the second. Under construction projects also increased to 8.9 million square feet with rents up 2 percent over-the-year to $0.57 per square foot. Development of new industrial space remains quite active.
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Featured News
Mar 10, 2020
Colliers International in Arizona announces 2019 top producers
Colliers International in Arizona announced its top producing agents for 2019. Four of the firm’s top producers were women. The company’s brokerage professionals exceeded 2018 performance by 13 percent, creating Colliers’ second-best year since entering the Arizona market.
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Feb 18, 2020
Phoenix industrial market maintains low vacancy
The Greater Phoenix industrial real estate market has a very healthy equilibrium in the midst of bringing millions of new square feet to its inventory, reports Colliers International. Vacancy remains below 10 percent after adding 6.4 MSF of new space in 2019, and 10.5 MSF under construction.
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Nov 8, 2019
Colliers International sells Gila Springs Industrial Park in Chandler
Colliers International negotiated the sale of Gila Springs Industrial Park, a five-building industrial complex near Chandler Boulevard and Kyrene Road in Chandler, Arizona, for $10,069,910. Bird Dog Industrial, a La Jolla-based investment firm, purchased the property as its third industrial asset in metro Phoenix.
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Oct 16, 2019
Phoenix industrial market expected to keep robust pace
The Greater Phoenix industrial market remained strong through 3rd quarter, posting net absorption of approximately 1.23 MSF. Continued job growth has fueled leasing activity and construction of new developments. Colliers International forecasts the robust activity to continue through 2019.
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