1. A system for designing accessible and usable spaces having built-in elements in a multi-unit apartment environment, the system comprising: a library of pre-designed universal built-in elements for the multi-unit apartment environment prior to build of the multi-unit apartment environment, each of the pre-designed universal built-in elements including structural data indicative of clear floor space compliance, reach range compliance, and operable parts compliance, each of the pre-designed universal built-in elements including structural data indicative of anthropometric data compliance for unknown universal non-physically challenged persons and universal unknown physically challenged persons, each of the pre-designed universal built-in elements further including drawing pre-built, non-as-built data, each of the pre-designed universal built-in elements being anthropometric data compliant with both the universal unknown non-physically challenged persons and universal unknown physically challenged persons such that the universal unknown non-physically challenged persons may independently reside in any unit of the multi-unit apartment environment and the universal unknown physically challenged persons may independently reside in any unit of the multi-unit apartment environment; and a design engine designing a unit of the multi-unit apartment environment prior to build of the multi-unit apartment environment, the design engine having a processor and memory accessible to the processor, the processor configured to communicate with a user interface, the memory accessible to the processor, the memory including processor-executable instructions that, when executed, cause the processor to: receive input criteria associated with design preferences via the user interface, the input criteria relating to design and functionality of the multi-unit apartment environment prior to build of the multi-unit environment, access the library to automatically identify certain ones of the pre-designed universal built-in elements that satisfy the input criteria for the unit of the multi-unit apartment environment prior to build of the multi-unit apartment environment, transmit models of each of the selected pre-designed universal built-in elements to a workspace of the user interface, the models being derived from the drawing pre-built, non-as-built data, the models being for the unit of the multi-apartment environment prior to build of the multi-unit apartment environment, receive input regarding a desired arrangement of the models within the workspace via the user interface, and determine, based on the embedded information of the selected pre-designed universal built-in elements, if the desired arrangement of the models fulfill anthropometric data compliance rules, arrange the models based on the received input regarding the desired arrangement, and replicate the arrangement of models for the unit to create the multi-unit apartment environment wherein actual unknown non-physically challenged and unknown physically challenged persons may utilize each unit in the multi-unit apartment environment after build.