Kilroy is still here, especially if you're referring to the West Coast. A self-administered real estate investment trust (REIT), Kilroy Realty owns, manages, and develops Class A office space, mostly in suburban Southern California’s Orange County, San Diego, and Los Angeles, but it has since expanded to the San Francisco Bay and greater Seattle area to woo technology companies as tenants. Its portfolio includes about 115 office properties encompassing more than 13 million square feet of leasable space. A majority of Kilroy Realty's 500-plus tenants are involved in technology, media, financial services, and real estate.