I've been researching servicers and building data on a very small list.

@Jonathan Klemm I originate private loans, so I also handle the financing aspect.

.)- Average days on market- Absorption rate- Historical data on rents and sale prices in the area- Population growth- Main economic drivers (industries, individual companies, etc.)- Crime stats... if you know specific zip codes/submarkets that you'd like to target, the best data will come from local precincts. - and more..I'd recommend remaining active not only here on BiggerPockets, but in other valuable RE investment networks that you can find - i.e. local meetups (meetup.com, eventbrite, BP local events). 

Now his original property is less cash flow, and is his 2nd is likely negative $500/mo.

Don't worry about minor complaints, you are doing a fine job.Just one question, ALL sites have a delay in data from MLS updates, and from court reported information, and so on, is that a function of a monthly update routine or can the information be updated a little more frequently? 

The "high appreciation rates" you mention should be verified with recent data and be specific to the neighborhoods you're targeting.

The original six month tenant I had extended the lease 9 times and stayed a total of 5 years, paying me about $15k over market rent annually.  

Originally posted by @Rich N.

April is the only real low month.It's a funky place -- essentially a 5 room motel (originally built 1959) with a manager's unit (built 1984) tacked onto it. 

Even with 200 STRs it isn't a broad enough cross section to assume the changes.You would need to have millions of data points to show the trend IMHO.