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    Our Team

    Jonathan Marks Founder and CEO

    Jonathan is Founder and CEO of The Clinical Group which includes Clinical Medical Real Estate Solutions, Clinical Advisory Group, Clinical Development and the Physicians Fund. He is a trusted advisor to physicians, medical groups, hospitals and investors for their Medical Real Estate and has been one of the pioneers leading the charge for more optimal solutions for the Healthcare Real Estate Industry since previously launching Cresa's Medical Practice Group in 2013. Jonathan was named to NJ Biz's 2025 People to Watch i...

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    Walter Lestrange Operating Partner

    Walter along with Jeff lead Clinical Advisory Group focused on aligning clinical strategy, operations and real estate. He is a seasoned healthcare executive with over 25 years of experience driving growth, operational transformation, and financial performance across hospitals, multi-site medical groups, and private equity–backed platforms. He has held senior roles at Health Plus Management, Nuvance Health, Zenyth Partners, and ProHEALTH (an Optum company), leading integrations, scaling platforms, and delivering impro...

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    Jeff Tarlowe Operating Partner

    Jeff along with Walter leads Clinical Advisory Group focused on aligning clinical strategy, operations and real estate. He has extensive healthcare expertise spans more than 30 years in finance and operations. As CFO of Optum Care, East Region, he oversaw expansion to more than 600 medical sites, 30+ specialties and over $1 billion in revenue. At Zenyth Partners and Health Plus Management, he drove substantial EBITDA and revenue growth for medical groups by adding clinical services, new providers, and streamlining oper...

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    Michael Swanson Director of Portfolio Transactions

    Michael is a 30+ year veteran in the commercial real estate industry with extensive Healthcare expertise. He has managed day to day real estate portfolio's for Davita (500+ locations) and US Oncology Mckesson (250+ Locations) at global real estate firms Cushman & Wakefield and CBRE. He has negotiated more than 1,000 transactions, spanning more than 2.5 Million Square Feet and saved his clients over $100 Million, He joins Clinical to lead it's Portfolio team managing specialty medical group and health system portfolio'...

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    SPECIALTIES: OFFICE, HEALTHCARE LEASING & INVESTMENT SALES Prior to joining The Clinical Group, Darren partnered with NAI James E. Hanson in 2000. Darren has actively represented clients in the leasing, acquisition and disposition of office, healthcare, and investment sales. Leveraging a 21+ year career and exceptional knowledge of commercial real estate, Darren advises landlords, tenants, healthcare professionals, and investors to ensure they make informed real estate decisions. A background in finance, econom...

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    SPECIALTIES: OFFICE, HEALTHCARE LEASING & INVESTMENT SALES An experienced commercial real estate broker and advisor, Randy specializes in office & healthcare leasing and investment sales. Prior to joining The Clinical Group, Randy spent 11 years at NAI James E. Hanson, and worked as an operations facility manager for a manufacturing company and spent 7 years as a real estate advisor for a northern NJ boutique real estate firm. Since 2003, Randy has conducted over 200 CRE lease and sale transactions. In additi...

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