Abstract: A robust portable building for use by persons for meetings, classroom use, entertainment facilities, trade show displays, or for human habitation, which provides an entry height of only seventeen inches above ground surface and which has the look, feel, and strength of a permanent structure. The building will withstand tornadic and hurricane level winds without the requirement of tie downs or permanent installation on a foundation. The structural members of the building are primarily steel components. A rigid steel frame is supported on pairs of steel rollers each of which has a diameter which is approximately equal in size to its surface width. All structural components are screwed or welded at their junctions with other structural components. A sheet of aluminum is mechanically fixed to the upper sides of the floor joists, over which are placed additional flooring layers. Each layer is fastened securely to the floor joists.