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Penciler is a web-based tool for multifamily housing development that lets you create and compare many different building options for a specific building site, helping you to make better-informed site acquisition and planning decisions. Penciler draws on local site and zoning data, allowing you to test multiple building options in real time. The tool allows users to quickly generate buildings and visualize both 2D floorplans and 3D massings in context, making it possible to explore different options depending on different building programs and zoning constraints. It can be used to visualize the effects of a local policy, such as a density bonus or inclusionary requirements, and analyze the costs and sources of funds for each building option, including for affordable housing.