John Sabourin

(949) 596-4103

John Sabourin

John has been representing tenants in the commercial real estate business since 1989. He is the Founder and President of Tenant Guardian.

John started his career in commercial real estate by representing tenants in their search for office space and lower occupancy costs.  John has represented Fortune 500 companies such as Aecom, CIGNA, Rockwell Collins, and Wells Fargo.  He was an early provider of corporate services.  John has managed over 13 million square feet of real estate transactions across the United States and in multiple countries around the world.  John has been highly recruited by and has worked for some of the biggest names in the business including, Colliers, Studley and CBRE.

John is focused on protecting his clients from needlessly high occupancy costs through thoughtful strategic planning, tenacious negotiation, and rigorous management of the lease throughout the lease term.  His strategic mindset helps his clients plan for the future and unlock capital through properly structured transactions.


In addition to real estate, John has many interests including sailing (NHYC), surfing, cycling, and USC Football.  He enjoys working on just about any do it yourself project when not working on his clients’ important transactions.  John is supporter of many charities and currently serves on the board of directors of CASA Orange County.  John Lives in Newport Beach with his wife and two children.


Tenant/Buyer Industry Size/SF
AECOM* Engineering 6,000,000
Caremark* Insurance 2,500,000
Dataproducts Technology 600,000
Health Net Insurance 333,954
Health Net Insurance 288,749
Intuit Technology 167,420
CIGNA Insurance 165,000
IMT Real Estate 140,000
Pacific Dental Insurance 140,000
CIGNA Insurance 125,000
United Online Technology 111,551
Viking River Cruises Travel 111,000
Sunkist Growers Marketing 96,115
Canon Business Solutions Technology 95,000
Delma Properties Inc. Real Estate 95,000
Delma Properties Inc. Real Estate 83,000
CIGNA Insurance 78,472
CIGNA Insurance 76,997
Realty Bancorp Real Estate 75,812
Viking River Cruises Travel 72,007
ATK Technology 68,000
CIGNA Insurance 61,839
Baxter Healthcare Corp Healthcare 61,000
Delma Real Estate 60,000
IntraCorp Insurance 54,179
CIGNA Insurance 50,118
Amwest Insurance 50,000
Tetra Tech Engineering 50,000
Barrister Executive Suites Real Estate 40,000
Essex Portfolio, LP Financial 40,000
Sunkist Growers Marketing 40,000
Western General Insurance Insurance 40,000
CIGNA Insurance 39,648
Lovelace Insurance 39,096
Poms & Associates Insurance 37,284
Care Level Management Insurance 36,922
Health Net Insurance 34,987
Wachovia Securities, LLC Financial 34,960
Western General Insurance Insurance 32,000
Viking River Cruises Travel 31,942
Univision Music, LLC Entertainment 31,902
First Union Securities, Inc. Financial 29,432
INA Insurance 28,000
Markel Corporation Insurance 25,350
Viking River Cruises Travel 24,981
Connecticut General Insurance 24,334
CIGNA Insurance 23,661
Dolby Laboratories Entertainment 22,847
CIGNA Insurance 21,000
Life Care Insurance 20,495
Markel Corporation Insurance 20,423
United Vision Financial 20,000