Credit Karma, the credit information tech startup with a $3.5B valuation, could nearly triple its office space if a deal goes through to lease up to 150k SF in the North Financial District.

The company has been looking at 650 California St, owned by Columbia Property Trust, as well as several other locations in the city. There's about 172k SF of office space up for grabs in the 33-story building, with a chunk of that freeing up with the local downsizing of Littler Mendelson, reports the San Francisco Business Times. The law firm has moved its corporate positions to Kansas City, where it's less expensive to operate.

Meanwhile, Credit Karma is looking to expand. The company started out offering credit report services, but is growing into other financial services, such as refinancing student loans, getting offers on car and business loans, finding auto insurance savings and comparing credit cards. The company's HQs are in the Phelan Building at 760 Market St, where it signed a lease for 46k SF last year.

If Credit Karma leases at 650 California, it would place it among the largest office leases in San Francisco this year. Other tech companies (Stripe, Uber and Fitbit) have signed large leases as well. [SFBT]