Fire investigators are working today to determine what caused a fire on Saturday night that destroyed some businesses in western Henrico County.

Among those destroyed or severely damaged in the fire at the Innsbrook Corporate Center was the Richmond Hope Therapy Center.

The therapy center was one of the larger tenants at 5030 Sadler Place near the Glen Allen post office. The two-story building, which county records show was assessed at $1.04 million, had about a half-dozen businesses as tenants.

Therapy-center owner Cindy Richards was counting her losses yesterday while her husband, Richmond Hope Foundation President Mike Richards, worked with fire officials to recover a computer hard drive. He got it out before the building was to be boarded up yesterday.

The Richardses lost equipment Cindy uses for intensive therapy for children with special needs, such as cerebral palsy. She said she has the only center in the state using TheraSuits, which cost $2,500 apiece, and Universal Exercise Unit cages, which cost $5,000 each.

She had just agreed to lease the entire first floor on her side of the building, giving her more than 3,000 square feet. She's already starting to look for a new location.

If she can quickly find a new place, "I believe in two weeks we can be up and running," she said. But even if she could order new equipment today, "I don't have an address to deliver to."

She said the "Lose the Training Wheels" summer camp at the University Richmond will run as scheduled Aug. 4-8 to teach children with special needs how to ride a bike.

Mike Nelligan, owner of Marathon Medical, doubted that his company's supplies of orthopedic implants could be salvaged from his second-floor office.

"These are things that are supposed to be sterile," he said. "If they're not cooked or melted, they are ruined if they're not sterile."

Wayne Bard said his office at Atlantic Equities and Exchange also was on the second floor. "It's downstairs now," he said, because the floor collapsed on his side of the building.

He wasn't concerned about his computer records because he has off-site backup. "We will have to re-create paper files, but we have lots of duplication and tons of backup. It's photos and mementos that are lost."

Bystanders alerted authorities to the fire Saturday about 9:30 p.m. Flames were 20 to 30 feet high and the roof had caved in when the first fire unit arrived, said Gary Hutchison, assistant fire marshal.

Embers blew down on a nearby building, causing damage to the roof. Contact Katherine Calos at (804) 649-6433 or kcalos@timesdispatch.com.