As part of Townhouse Center's "Mid-Rise Madness" series, a note that Columbia University has made available on the internet for free an entire video series on New York City's tenements and evolution to larger mid-rise apartment buildings. The lecture is delivered by Prof. Andrew S. Dolkart, and is available in video segments (each just a few minutes) or transcript format, or as one paper. Topics include: Dumbbell Tenements, Model Tenements, East River Houses, Union Housing, Emulating the Suburbs, Six-Story Buildings, Using Traditional Forms, and Downzoning. Some latter segments include discussion of apartment towers that are antithetical to this blog, but don't let that dissuade you from watching the entire series, which moves quickly and is very informative.