I worked under a Doctor who was an apartment investor for a couple years. When it came time to consider a new complex to purchase, or a new town to build in, we would do some pretty standard analysis regarding the demographics. It was mostly, however, information pertaining to the average income, who the citizens of the town were, their behavior.. etc.  I'm looking to get into smaller multi-family investing as well as some single family investing, and am curious as to what key elements you look for when at comes to market analysis regarding both potential buy and hold properties and rehab properties. Thank you so much!