Bill Smith, past president of the party, said Friday that the moves are being made to save money.
"We have got to look at the longterm interests of the party and the carrying costs of the infrastructure that we have is just too high," he said.
The PCs were reduced to 10 seats in the legislature from 70 in the May 5 NDP election victory that ended 44 years of Tory rule in the province.
Smith said the office closures and staff cuts were a difficult but necessary decision as the party takes the first steps toward rebuilding.
"We are definitely not finished in Alberta. The number of people who have reached out to myself and to members of our executive has been overwhelming," he said.
"So many people were disappointed in the result and have offered to help."
Twelve people are losing their jobs.
Earlier this week Ric McIver was named interim PC party leader to replace Premier Jim Prentice, who resigned on election night.
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