"Near" or "Generate Near Table"
This tool takes a feature's location and records its distance to other features. From there, the distance is either added to the data table of your original feature, or can be joined manually (which is very helpful, because once you use the Near tool, there is no way to remove the results if desired, ie wrong measurement unit, etc.) The tool is located under Analysis Tools _ Proximity
For Team Homeless, as we create TINs based on time/frequency of certain amenities in relation to spatial features, considering distance may also be useful. Consider a 2G TIN relating distance, location, and time. Check-in soon to see the results!