The second 72,000-sf building, to be delivered at the end of this year, would have been speculative had tenants not scooped up the space so fast. As is, building No. 2 is already two-thirds leased, says Jim Mark, president of Melvin Mark Companies, the Portland-based development, management and brokerage company.

"That made the decision (to break ground) a lot easier," Mark tells GlobeSt.com. Mark isn't revealing the tenants' names until they give him the go-ahead, but it's sparked development that is already permitted and set for a July ground-breaking. Mark says there are proposals out that, if signed, would fill 70% of the next two phases.

Sunset Center will be a campus-style development with a central plaza "that will be good for concerts," says Mark. The project is located at 194th and Evergreen, about one-eighth of a mile from AmberGlen Business Center, a campus mixed with flex and class A office space.

Other class A office space is being developed in Beaverton by Opus Northwest at 1500 N.W. Bethany Blvd., south of Sunset Highway. That 120,000-sf building is now open with five tenants taking 45,000 sf. They include Country Companies, an insurance provider; Lectrix; Adams & Associates; CDI Body Imaging; and Chase Manhattan.

Melvin Mark hopes to make its fourth building at Sunset Center a seven-story, 150,000-sf structure. It's currently slated at 110,000 sf. "We're hoping to build the biggest class A office building out there," Mark tells GlobeSt.com.