Gerdom Realty & Investment

(248) 242-6766

Monday - Friday: 8:30 AM - 5:00 PM

About GR&I


GR&I is responsible for tenant and landlord representation, the buying and selling of commercial and investment properties, land assemblages, development of commercial and residential vacant land, and property management. A representative list of past customers includes; YUM! Brands, Family Video, Starbucks Coffee, Ramco Gershenson, Regency Centers, Tony Sacco's Coal Oven Pizza, Aaron Rents, Walgreen's, CVS, Dunkin' Donuts, Pancheros Mexican Grill, Pet Supplies Plus, Advance Auto Parts, and PNC Bank.

Tjader T. S. Gerdom



Mr. Tjader T. S. Gerdom
Tjader Gerdom is the principal of Gerdom Realty & Investment and entered into the commercial real estate industry in 1997. Beginning a career at Schostak Brothers & Company, Inc. he worked closely with several experienced commercial retail brokers building service and sales skills while increasing his market knowledge. In 2001, Tjader joined Insite Commercial Group and was promoted to Vice President in 2002 where he directed the Commercial/Retail Team. Tjader joined Colliers as a Vice President as part of the merger with Insite Commercial Group in January 2006. 

In January of 2009, he launched Gerdom Realty & Investment, in order to adapt to the changing commercial marketplace to take advantage of the current weak economy to benefit his clients' investment needs. Tjader is a member of the Detroit Area Commercial Board of REALTORS®;, Michigan Association of REALTORS®;, National Association of REALTORS®;, Downriver Chamber of Commerce, ICSC, and has sat on the ICSC State Committee from 2009 to the present.

Larry Siedell



Mr. Larry Siedell

Larry started in the commercial real estate industry in 2003, working with Tjader and Insite Commercial Group, where he focused on retail leasing and site selection. Leasing quickly grew into market development and disposition for national clients, shopping center development and investment sales. During his time with Insite, he obtained the skills necessary for finding opportunities and making commercial real estate transactions happen. 

In 2006, Larry joined The Velmeir Companies and spent over five years assisting with the growth of CVS/pharmacy. His projects included new and established market growth both organically and through acquisition. The experience with Velmeir provided Larry with a 

fundamental understanding of strategic market planning, market presentation and market penetration. Primarily working with CVS/pharmacy, Larry was instrumental in planning, identification, presentation, procurement, entitlement and construction management completing nearly 50 drug store projects across 8 states.

In 2012, Larry rejoined Tjader and Gerdom Realty & Investment and currently works on a broad range of commercial and residential real estate projects encompassing all of his past experiences and relationships.

Joel Karboske



Joel started in the commercial real estate industry in 2003 after graduating from Aquinas College with First Commercial Realty & Development, specializing in representing retailers, landlords, and developers in the sale and leasing of shopping centers, freestanding buildings, land assemblage, new development and redevelopment opportunities earning top sales awards each year. In 2007 Joel became a co-founding partner of Paramount Real Estate Services, where he was responsible for high profile tenant representation, land assemblage, site identification, purchase and lease negotiations throughout Michigan, Ohio, Pennsylvania, New York, New Jersey, North Carolina, and South Carolina.

Some of his clients include Walgreens, White Castle, Popeye's Chicken, Dunkin Donuts, Murry Retail Group, and Bacall Development. In 2016, Joel teamed up with Gerdom Realty & Investment and continues to approach every assignment with unparalleled experience and enthusiasm, ensuring that each client receives the highest quality of service. Joel is a member of the International Council of Shopping Centers (ICSC), National Association of REALTORS®; (NAR), Commercial Board of REALTORS®; (CBOR), Officer of the Knights of Columbus (12408) and on the board of several local organizations.

Vicki Gutowski



Vicki Gutowski graduated from University of Michigan with a BA in Economics in 2012 and from Eastern Michigan University with an MBA in 2017. Since joining Gerdom Realty in 2012, Vicki has gained experience working on both landlord and tenant representation. As director of marketing and administration, Vicki oversees the advertising regiment for the company’s listings as well as the creation of presentation material for tenant and buyer representation clientele on top of property management and day-to-day administrative operations.


Michael Murphy



Michael Murphy
Michael Murphy earned his Associates Degree in Liberal Arts from Oakland Community College in 2014. He started his career in Real Estate thereafter with Gerdom Realty & Investment as a Real Estate Sales Associate. Michael is focusing on shopping center sales and leasing, and he assists the company in conducting market research throughout metro Detroit and creating client presentations. Michael has a strong background in restaurant operations and working with the general public and is using this experience along with his positive outlook to develop meaningful relationships in the real estate community.

Bill McLeod


Bill McLeod

Bill specializes in the sale and leasing of commercial properties with expertise in student-housing investment properties in Ann Arbor and East Lansing. He joined Gerdom Realty after six years with Thomas Duke Commercial Real Estate. And earlier employment in the commercial building industry has given Bill a sharp sense for the bottom line. Furthermore, Bill brings the persistence and versatility of a two-sport college athlete and creative, out-of-the-box thinking, making him a valuable asset to buyers and sellers alike. He’s currently seeking his CCIM designation.


Audrey Langewicz


Audrey Langewicz Audrey Langewicz graduated from Central Michigan University in 2012 with a BA in Law & Economics. Her real estate career began on the residential side, but she transitioned to commercial in 2019, joining the Gerdom Realty & Investment team. Audrey’s background provides her with a strong understanding of business, sales & target marketing which allows her to be versatile in the real estate industry. Since starting with Gerdom Realty & Investment, Audrey has been focusing on the sale/lease of shopping centers and is working towards learning & building her knowledge on development & investment opportunities.