US Patent 11753815 Modular building system

A modular building system, includes a modular building assembly, including a base mounting structure with first and second base angle brackets; a left receiving wall assembly, including a left primary wall assembly, and left front and left rear corner brackets; a right primary wall assembly, and right front and right rear corner brackets; and front and rear wall assemblies; and a platform with legs; such that the modular building assembly is positionable on a top surface of the platform.