Here is a (kinda cheesy)
slide show of the building of the Cumberland County Civic Center.
On June 23, 1972, the site for the proposed $5 million Cumberland County Sports & Convention Center was chosen from among three finalists; Gorham, a site on 20 acres in South Portland by the newly constructed Maine Mall, and the site on which it stands today in downtown Portland, nestled between Free and Spring Streets. The design for the structure was made public in November of 1974 by architect E. Crawley Cooper, and the site work began in early 1975.
tip:
All Things Maine