Diverse talents with a singular vision
Experience makes all the difference.

At Glenstar, everything from our curated team of experts to our collaborative work style is designed to be exceptional. We care about increasing property values while being true to our tenants and our investors. We never stop seeking new and creative ways to go beyond.

Michael Klein
Co-Founder & Managing Principal

Michael Klein
Co-Founder & Managing Principal
Michael co-founded Glenstar in 2004. He helps drive the strategic direction of the company and is passionate about building transformative spaces that encourage work/life balance and building a sense of community. He is involved in all aspects of the business, working closely with the firms acquisition and asset management teams. He serves on the Glenstar Investment Committee.
Michael brings over 30 years of commercial real estate experience and industry thought leadership. He enjoys skiing and golf, but his real passion lies in his CrossFit workouts.

Brian Netzky
Principal

Brian Netzky
Principal
Brian brings an extensive industrial real estate background spanning more than 30 years to Glenstar. During that time, Brian founded a nationally renowned industrial brokerage firm which he led for more than 15 years before merging with Colliers International in 2018. While at Colliers, Brian was instrumental in collaborating with Glenstar on Tri-County 75 in Fort Myers, which broke ground earlier this spring.
Throughout his career, Brian has executed occupier strategy and site selection on many of the largest industrial leases in North America. He has successfully negotiated over $750M of industrial leases across 70 major markets.

Rand Diamond
Co-Founder & Principal

Rand Diamond
Co-Founder & Principal
Rand co-founded Glenstar in 2004. He provides leadership support for the asset management and development businesses, serves on the Glenstar Investment Committee and helps drive the strategic direction of the company.

Colleen Cordia
Executive Director, Finance & Accounting

Colleen Cordia
Executive Director, Finance & Accounting
Colleen oversees finance, accounting and administration for Glenstar. She joined in 2019 and has over 25 years of experience in accounting, tax and financial reporting and for commercial office properties.

Michael Giese
Executive Director

Michael Giese
Executive Director
With over 25 years of commercial real estate experience, Mike’s responsibilities include asset management and oversight of the firm’s finances and property management platform.
Prior to joining Glenstar, he spent 5 years with Tishman Speyer managing several large commercial office projects in downtown Chicago. Before his career at Tishman, Mike held regional and national roles with Equity Office Properties Trust (EOP), spending time in property management and national property operations.
Mike is a Certified Public Accountant (CPA), holds the Real Property Administrator (RPA|HP) designation from BOMI and the LEED GA designation from the USGBC. He is a member of IREM and BOMA, serving on the Board of Directors and as Treasurer of BOMA Chicago. Michael is an active volunteer with the West Suburban Humane Society and enjoys spending time with friends and family in his free time.

Mickey Stefan
Executive Director

Mickey Stefan
Executive Director
Mickey has over 15 years of commercial real estate experience. His responsibilities include strategic visioning and oversight of Glenstar’s asset management portfolio across the U.S., where he works directly with acquisition, leasing, marketing and property management teams.
Prior to joining Glenstar in 2016 he was an intregal part of the Equity Office team, as a Manager of Corporate Finance and Treasury/Capital Markets. Throughout his career he’s worked on the closings of over $13B of new debt and refinancings and $5B in acquisitions and dispostions.
When not closing deals he enjoys camping, time on the green, and spending time with his family on Loch Lomond Lake.

Becky Diehl
Executive Director, Marketing & Customer Experience

Becky Diehl
Executive Director, Marketing & Customer Experience
Bringing over two decades of experience, Becky oversees all aspects of Glenstar’s property and corporate marketing strategy as the firm continues to expend their footprint within the industrial sector. Her current responsibilities include brand development and management as well as spearheading the firm’s hallmark customer experience platform, Glenstar Connect.
Prior to joining the team she spent 5 years with Ryan Companies where she oversaw all Great Lakes regional marketing including business development, brand awareness and client relations. During this time she received a National award from SMPS for the development of an internal web application. When not in the office enjoys spending time outdoors, particularly when watching her son’s sporting events or sitting on the dock of her family’s Michigan lake house.

Mike Mrachek
Executive Director, Construction & Development

Mike Mrachek
Executive Director, Construction & Development
Mike is focused on the operational management of development projects across the portfolio including ground-up development, major capital renovations, and turnkey tenant improvement projects.
He brings over 15 years of construction and development experience in high-profile commercial and industrial projects from Leopardo Construction and FCL Builders. During his tenure he was responsible for nearly $500 million in projects focused on office, mixed-use, industrial and site development.
When not on a Glenstar jobsite you may find him volunteering on a build within his community or riding a single-track trail.

Mike DePrey
Executive Director, Construction & Development

Mike DePrey
Executive Director, Construction & Development
Mike brings over 15 years of experience to his role as Executive Director of Construction and Development where he is responsible for the execution of development projects, from land pursuit through construction completion. Prior to joining Glenstar, Mike was with Duke/Prologis where he managed the design and construction of over 6M SF of Industrial Developments across the county.
In his spare time Mike enjoys golfing, playing softball, watching sports (Boiler up!) and spending time with his family.

Jeff Koukol
Director

Jeff Koukol
Director
Jeff has over a decade of commercial real estate experience. His responsibilities for Glenstar include development, acquisitions and asset management throughout the U.S. He has been instrumental in the success of Cherokee Commerce Center 85.
Prior to joining the team in 2016 he was part of the corporate finance group at EQ Office (formally Equity Office). Outside of the office this Cornhusker enjoys traveling the world with his wife and spending his weekends on the greens.

Anthony DeAgostino
Director

Anthony DeAgostino
Director
Anthony joined Glenstar in 2019 covering both Acquisitions and Asset Management throughout the U.S. Prior to joining Glenstar, Anthony spent 3 years working as an investment sales broker specializing in office and industrial dispositions nationwide.

Bill Saviski
Managing Director

Bill Saviski
Managing Director
As Managing Director of Leasing, Bill is responsible for leasing much of Glenstar’s suburban Chicago portfolio (Schaumburg Corporate Center, Continental Towers, Presidents Plaza and Bannockburn Lakes). Since joining the team he’s secured deals for roughly 2MM SF. He previously worked for CBRE in a similar role.
Aside from his passion for real estate, he loves watching and coaching his kids sporting activities.

Christian Domin
Managing Director

Christian Domin
Managing Director
Christian, a 29-year industry veteran, leads suburban and downtown Chicago leasing efforts for Glenstar, including projects at Presidents Plaza, Continental Towers, Schaumburg Corporate Center and Bannockburn Lakes.

Ben Herzon
Associate

Ben Herzon
Associate
As an Acquistions and Asset Management Associate, Ben is primarily involved in the due diligence and underwriting of potential acquisitions, as well as general support for development deals and asset manangement for Glenstar’s office portfolio.
Prior to joining Glenstar in 2023, he earned his BBA in Real Estate and Urban Land Economics from University of Wisconsin-Madison and worked for Brookfield Properties as a development analyst. When not in the office you can find him at cheering on the Cubs, at a local music venue, or on the fairway.

Mike Roa
Marketing & Events Manager

Mike Roa
Marketing & Events Manager
Mike joined Glenstar in 2022 to lead Glenstar’s industry leading tenant engagement program, Connect. In this role, he is focused on curating and managing events that build community and increase tenant satisfaction across the Glenstar portfolio.
He brings nearly 15 years of experience in marketing, events and property management within both the office and retails sectors from Golub & Company and Corporate Concierge Services. He also has a passion for giving back to the community through his participation with Stonewall Sports – an LGBTQ+ & Ally, non-profit sports organization that strives to raise funds for Chicago non-profit organizations.

Erica Collins
Office Administrator

Erica Collins
Office Administrator
Erica joined Glenstar in 2021. As office administrator, she manages the daily activities and operations of the corporate office and coordinates corporate policies and projects across Glenstar’s portfolio.
She is an avid dog lover, with 4 of her own at home and volunteers her time at GRRACE – a local golden retriever rescue association. She’s also passionate about fitness and travel and enjoys exploring the world one hike at a time.
From notable developments to thought-leading perspectives, check out what we’re up to.