John Dettleff

John Dettleff

Senior Managing Director, Brokerage

Current responsibilities
John leads JLL's industrial/flex team in the Washington Metropolitan area. He and his team represent both investors and occupiers, completing over $125M in transactions annually.

John has a wide range of investor and occupier clients, including JP Morgan, MRP Realty, Finmarc Management, Global Logistic Properties, Matan Companies, and RealTerm Logistics, Iron Mountain, CORT, Jenkins Restoration, Crane Service Corporation, Boland, and Comcast.


  • 2006 – 2011:  Vice President, Grubb & Ellis Company
  • 2001 – 2006:  Associate Director, Advantis Real Estate Services Company
  • 2000 – 2001:  Research Analyst, Advantis Real Estate Services Company
  • 1999 – 2000:  Real Estate Analyst, CoStar Group

Recent client transactions

  • Iron Mountain, Washington Metropolitan area: over 1,000,000 s.f. new leases, lease restructuring and building acquisitions
  • JP Morgan/MRP Urban Industrial I-95 Industrial Portfolio, Springfield VA: 1,000,000 s.f. acquisition advisory and agency leasing
  • Matan Cos. NOVA Industrial Portfolio, Dulles and Alexandria, VA: 785,000 s.f. acquisition advisory and agency leasing
  • Steuart Investments’ Featherstone Industrial Park, Woodbridge, VA: 750,000 s.f. investment sale and agency leasing
  • DCT’s Downs Park, Dulles VA: 25 acre land sale and 300,000 s.f. BTS for Amazon Web Services
  • Georgelas Group’s 8500 Tyco Road, Tysons, VA: 150,000 s.f. acquisition representation, subsequent 50,000 s.f. lease to Tesla Motors and 25,000 s.f. condo sale to Verizon
  • CORT, Capitol Heights, MD: 100,000 s.f. lease restructure


  • MBA, Finance and Marketing, Marymount University, Arlington, Virginia (2003)
  • BA, Literature, Marymount University, Arlington, Virginia (1998)
  • BA, Philosophy, Marymount University, Arlington, Virginia (1998)
  • Member of the 2030 Group