Building element for a prefabricated, modular, semi-permanent and relocatable structure

A building element for a semi-permanent and relocatable structure, said building element comprising:

• a member having a uniform, rectangular, cross-sectional shape that includes an interior portion that has a top, a bottom, two sides and four corners formed by the intersection of said sides with said top and bottom, and said member also having distal and proximal mitered, open ends and a member centerline therebetween,
• a pair of flanges, one of which extends outwardly from each of said two corners formed by the intersection of said sides with said top, and with each of said flanges having a boundary surface that is parallel to said top,
• a pair of cavities, with each having a cavity sidewall and a pair of cavity end entries, one of which is located at each of said member open ends, and with said cavities being located in said member interior portion,
• an opening in each of said sidewalls that extends between said member ends and has an opening centerline, and configured to provide access to said cavity, and with each said opening centerline being aligned parallel to said member centerline, and
• a 90-degree, flat, mitered bracket having two legs, each of which has a free end that is configured to slip fit into the cavity end entry of each of two members that are to be joined at their mitered, open ends at a right angle.