When the summit group outgrew its downtown Salt Lake City offices, it spent four years examining 70 different buildings before finding a suitable new location.

Steve Brown, president of The Summit Group, recalls scouring the downtown area — from 600 North to 700 South and 1300 East to 700 West.

"I actually physically went through and drove the neighborhoods with a Realtor," Brown said. "When we couldn't find anything at all, we started looking at places we could go through and retrofit."

Instead of giving up on downtown and moving to the suburbs, where premium office space is plentiful, the public relations firm decided to restore the old United Electric Building, located at 117 W. 400 South, pouring more than $5 million into the run-down structure to bring it up to standard.

The building, built in 1923, had to be completely gutted. A new roof was added. Windows, wiring and plumbing were replaced. New heating, ventilation and air-conditioning systems were installed. And modern seismic standards were met.

"This was more of a warehouse than it was an office," Brown said. "I think it's unique in that we've brought the old and new together. We've got all the modern technology. We've got a brand new facility, but it still has a rustic appeal."

With premium office space in downtown Salt Lake City nearly nonexistent, The Summit Group had little choice but to renovate an old building or settle for less than premium space.

Chris Kirk, office specialist with Commerce CRG, a Salt Lake-based commercial real estate office, said most of downtown's high-end office buildings are full.

The Wells Fargo Center, at 299 S. Main, had a vacancy rate of less than 1 percent in the first quarter, while the One Utah Center building remained completely occupied. The Gateway Tower West, on the corner of South Temple and Main Street, also is 100 percent occupied. And the 170 S. Main building, formerly the First Interstate building, has less than a 4 percent vacancy rate.

"If you understand the market and you know what's going on, then you've got to get in line," Kirk said. "If you know a tenant is vacating space, you've got to be there. You've got to negotiate that space before the tenant moves out."

Brandon Fugal, vice president at Coldwell Banker Commercial NRT, said downtown's limited space is part of the reason more companies are moving to suburban office parks.