1. A method comprising: while a first image of a single floor of an existing multi-unit facility is being displayed, receiving, through a drawing component, first input to create a marked-up first image using a drawing tool; wherein the first image depicts a floor with existing one or more rooms; wherein the first input marks up the first image to indicate at least one location and boundary, on the-single floor, for each individual habitable unit of a plurality of individual habitable units that are depicted in the first image; displaying a base image that depicts an actual geographic area on which resides the existing multi-unit facility; wherein a mapping between points on the base image and a plurality of actual geographic coordinates has been established; while the base image is displayed, receiving, through a fitting component, second input that associates one or more first positions in the marked-up first image with one or more second positions in the base image; based on (a) the marked-up first image, (b) the position of the marked-up first image on the base image, and (c) the mapping between the points on the base image and the plurality of actual geographic coordinates, automatically determining a set of actual geographic coordinates for each individual habitable unit of the plurality of individual habitable units; wherein the step of automatically determining assigns the same particular set of actual geographic coordinates to a set of corresponding individual habitable units; wherein the individual habitable units that belong to the set of corresponding individual habitable units reside at the same location, but on different floors, within the existing multi-unit facility; further comprising, after automatically determining the set of actual geographic coordinates for a particular individual habitable unit of the plurality of individual habitable units: receiving a visual information that depicts a possible view, from a window of the particular individual habitable unit, away from the existing multi-unit facility; and storing data that associates the visual information with the particular individual habitable unit; wherein the method is performed by one or more computing devices.