Option One to Expand at Irvine Spectrum

Option One Mortgage will expand to other buildings in Irvine Spectrum in September in a $32-million lease transaction with landlord Irvine Co.

The 250,000-square-foot lease is believed to be the largest in Orange County this year, said broker Steven Pisarik of Colliers Seeley, who represented the tenant.

Option One will expand from Lakeview Business Center into four buildings on Irvine Center Drive.

That will raise its total occupancy in Irvine Spectrum, a business park at the intersection of the San Diego and Santa Ana freeways, to more than 426,000 square feet.

The Irvine-based company, a subsidiary of H&R; Block Inc., provides residential mortgage loans in 48 states.