The C3RRO® API to C3RRO Plus and Passive capabilities provides a seamless integration of the powerful building simulation tools into the workflow of architects, engineers, and building professionals. The API enables the automation of building simulations, data retrieval and results presentation, providing a high level of efficiency and accuracy. The API access leverages the extensive databases and simulation capabilities of C3RRO Plus and Passive, allowing for the integration of simulation results into building energy analysis, performance optimization, and building certification processes. The API can be used to perform complex simulations, while also providing easy-to-use interfaces for quick analysis. The API access to C3RRO Plus and Passive offers an unparalleled level of building simulation capability to meet the ever-growing demands of the building industry.