
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.

$11,480,000 USD
Day Care Center - For Sale33,933 SF | 5% Cap Rate

$33.00 USD /SF/yr
Office/Medical - For Rent$16.80 USD /SF/yr
Flex - For RentJan '26
$19.80-$26.40 USD /SF/yr
Office - For Rent$23.40-$27.00 USD /SF/yr
Office - For Rent$19,115,000 USD
Office - For Sale35,418 SF | Request Cap Rate
RENT WITHHELD
Commercial Land - For Rent



