For example, for the last 15 years, we've targeted a narrow tenant pool segment.

I would suggest narrowing down a few markets that fit your goals @Yigal Uriel

On top of that (these were ski areas) the vacation ski season is so much shorter than the summer beach vacation season that your peak rent windows were much more narrow.  

That can narrow it down.

Try to narrow it down to your top 3-4.

The chances of a good buying opportunity jumping up in one or two specific neighborhoods in Clayton is narrow (not impossible).

Depending on what data you got with it, maybe you do not want people with senior exemptions, maybe you want in certain zip codes....somehow you want to narrow it down to the people most likely to sell.   

Probably helps narrow your responses if you include where the land is or what state you are in.You can check probate potentially if you know where they lived. 

Once you narrow down you specific wants, you can then start to drill down.

I am narrowing down my list and trying to categorize neighbords into B or C and also up and coming.