
With 35+ years in commercial real estate, John Bosko is a top-performing broker specializing in investment sales, leasing, and development across Southern California. Since 2020, he has closed 70+ transactions totaling $150M+, including a landmark $20.25M industrial sale, multiple medical office leases, and strategic land deals exceeding $8M in key markets like Corona, Tustin, Rancho Cucamonga, and Long Beach. His institutional expertise is demonstrated through 20+ successful renewals for a Fortune 500 manufacturing client. John has expanded his practice to emerging markets including Murrieta and Ontario while adopting cutting-edge technology to enhance traditional brokerage methods with his partner Zeshaan Abid. His current pipeline includes medical developments, land projects, value-add opportunities in office and retail, showcasing his ability to identify opportunities in any market cycle.

Jan '26
$19.80-$26.40 USD /SF/yr
Office - For Rent
$27.00 USD /SF/yr
Medical - For RentRENT WITHHELD
Commercial Land - For Rent$20.28-$33.00 USD /SF/yr
Office, Office/Medical - For Rent$23.40 USD /SF/yr
Medical - For Rent$23.40-$27.00 USD /SF/yr
Office - For Rent


