Firefighters spent the day moving things out of the bingo hall on 4314 South 40th Street on Monday.
The move comes after a steady decline in business and rising maintenence costs. The building's lighting bill alone was more than $2,000 a month.
The union is in the final talks with a western store to sell the building.
While Local 77 looks for a smaller building, they will use the Fire Museum as a temporary home.