An increase in Urban Operations training in the last few years has led to a greater reliance on highly detailed urban terrain databases for training simulations. These databases usually include buildings with realistic room layouts, and doors and windows for the ingress and egress of semi-automated forces. Training simulations that use dense urban terrain models require a variety of building types with differing layouts, ranging from small homes with simple room layouts to large office buildings with many floors and different layouts on each floor. Depending on the training objectives, these models may contain either geotypical or geospecific room layouts. Generating models of these buildings takes days or weeks. Not only is this costly, but it slows terrain database production, preventing fast turnaround of urban databases. In this paper, we introduce a new tool for rapid generation of urban terrain models. We describe the algorithms used to generate building interiors and discuss potential applications for these models. In some cases, models that used to take a few weeks to build can now be created in less than a few minutes. These models are created parametrically, permitting an unlimited variety of building shapes, sizes and types to be generated. An important feature of these models is that they contain structural properties. This enables modeling of physics-based interactions with the building. Terrain databases that include these models are supporting Future Combat Systems exercises using OneSAF Testbed (OTB) and the OneSAF Objective System (OOS).