It's embarrassing to admit, but I finally got around to playing with Carto for the first time. I loaded in my Jersey City buildings dataset and whipped up this map with two toggle-able layers: buildings by number of stories, and buildings by year built (the default display). You can click on buildings for other parcel information. The year built value comes straight from county assessor data, so it's a bit faulty (although I did a little manual clean up, e.g. replacing bizarre values like "9999" with NULL). The number of stories field was extracted from the "zoning description field" (I grabbed the numeric characters before the "S") from the parcel data. See my last post for information about where to download the Jersey City building footprints data, and see my last, last post for information on how I created that data.