Abstract: A modular building architecture is presented. The building structure includes a square or round-shaped modular unit and a loft positioned as an upper story to the modular unit. The modular unit comprises a roof that includes rain water collection gutters and channels or downspouts leading the collected rain water to rain barrels. The collected rain water is then pumped for use in the modular unit. The modular unit also comprises a bathroom and a kitchen that include smaller sized appliances and fixtures. The modular units create a modular system that allows for varying sized structures for various facilities. For example, multiple modular units can be connected together to construct an extended building structure or a medical or service facility. The additional modules would not include a kitchen, bathroom or upper story loft, but would provide additional living and/or sleeping quarters.