I spun up a quick Mobile POC with Angular/Ioinic using Google Maps but I haven't yet looked into other javascript mapping libraries, but I'll check those out.Your bio mentioned that you are experienced in real estate analysis and software automation.

Examples would be setbacks and easements.It's not the best instrument to use because it usually comes without a warranty of title.It's used a lot by government sales, sheriff sales, and the like.

I guess for now I will continue to work off printed spread sheets and look to automated this process in the future. 

It's unlikely that the little old person seller/lender could take that lump sum payout, put it in a CD or anything else comparably safe, and get more than they were getting from that loan.So a pro and a con:Pro: Better regular payout than a similarly safe-from-default instrument, like a CD, would pay (everyone here knows that a CD is just you lending money to a bank, right?

I figure I'll mail marketing pieces 5-20 times to each parcel - I'm looking for a way to automate this part as much as possible - to a point where I can enter the property data and details - and then track and send marketing as planned. 

Identify all your possible liens, and get the date they were recorded, and instrument number.2. locate all the lien releases.

Or should I continue to look for long term fixed rate instruments to fully leverage these properties and just pocket the cash flow? 

I believe a UCC1 will work for an investment property, but only if your lender is comfortable with this recorded instrument.  

Oh, one other thing - automate as much of the process as you can and get local representation (Attorney, Title, etc).

I highly recommend it.Additionally, J has laid out 5 critical focus areas of "automating" your operation that has benefitted me tremendously (in a short period of time) at my job.