Multi complex buildings. Multi-complex buildings are used primarily for two reasons: fast construction and low cost. Pre-fabricated, multi-complex buildings can be manufactured in a relatively short time and transported to your site and installed in just days. Whether you are looking for office space, a medical clinic, retail space, financial institution or an educational facility, let American Portable Buildings Corp. show you the possibilities. As with all custom buildings supplied by American Portable Buildings Corp. we offer services that will take you quickly from the design stage to manufacturing and to installation in far less time and cost than conventional construction methods. You can customize your building to give it the functionality that works for your needs and, at the same time, give your the building the character that sets it apart from the rest.