Ross Kendell, a former Key Bank president from 1987 to 1995, watched the implosion with "some very real sadness." His office for 15 years was at the top of the 290-foot building, with views of the state Capitol, Ensign Peak, Temple Square, the University of Utah and the Wasatch Mountains. "In my view, it was the finest office in town. I was very biased."

The falling of the tower marks the end of an era for the bank.

"I felt that the tower played a very important part in helping establish our bank as one of the major banks in the Salt Lake City and Utah market," he said.

Key Bank moved to the tower in 1980 from a nearby office building at 100 South and State Street, where it had been for five months. Before that, the bank was based in Ogden and was known as Commercial Security Bank.

"I'm satisfied that the development under way by the LDS Church will be a marvelous addition," Kendell said. "I've always been impressed that with everything the church undertakes it makes its decisions carefully and whatever it does is an improvement to what was there. Though I am age 73, I look forward to seeing it and recognize that I contributed a few tears to the cause."

Kendell's grandson, 5-year-old Joseph Kendell, was more succinct in his summary: "Cool," he said. He admitted he was tired and would probably take a nap later in the day, but he said it was well worth getting up early to watch the building fall.

The Key Bank tower is the last building on the Crossroads Plaza block to be demolished for the project. Demolition work has recently begun on the adjacent ZCMI Center block, but none of the buildings there will require implosion.

Okland Construction, which is handling the demolition work for the Crossroads block, opted for implosion for the tower rather than other methods of demolition because it was deemed the quickest, safest way to take the building down. Alternatives would have taken months and months, snarling traffic and kicking up dust daily.

Okland contracted with Baltimore-based Controlled Demolition Inc. to carry out the implosion. Officials did not specify how much the implosion cost, but they said it was more than $1 million. Still, they said manual or mechanical demolition methods would have been costlier.

Roads in the surrounding area, from North Temple to 200 South between State Street and 200 West, remained closed following the implosion as the dust settled and cleanup work began. Salt Lake City police officers providing extra security in the area were called off duty around noon and traffic resumed.

The Key Bank tower is the first building to be imploded in Salt Lake City since the Hotel Newhouse in 1983. Controlled Demolition also handled that implosion.

The Key Bank tower fell after a a series of sequential explosions from the southwest corner toward the northeast took out structural beams that left the building's 32 support columns with too much weight to bear, causing the tower to fall in on itself. A mix of explosives was used, mostly RDX inside extruded copper bars.

The dust kicked up by the implosion is mostly silica. Harmful materials like asbestos were removed from the building before the demolition. While the blocks immediately surrounding the implosion site will remain closed for much of the morning, the rest of downtown is expected to be safe to visit.

The Farmers Market in Pioneer Park is scheduled to go ahead as planned.

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E-mail: dsmeath@desnews.com