Is it finding deals, finding buyers, good comps (especially without direct MLS access)?

@Carter WallaceWell, a joint tenancy or tenancy in common is generally much more "restrictive" on what/how you control the passing of the interests.. 

This usually involves driving around the area I am interested in, at different times of the year and times of day, to get a sense of what kind of neighborhoods they are, flooding, seasonal access/closings, etc. 

Can i request access to a visual inspection of the house?

However you need to check the zoning restrictions for STVRs in your neighborhood.

Also, if at some point i decide not to sell the property or build as an investment but instead to build my primary residence on it, are there any tax restrictions, issues, etc?

The unit would be accessible from a rear street, so little to no interaction with us.

The radius approach could include more than 1 neighborhood (especially if there is an "accross the highway" scenario), I have access to propstream, flipster, and others but none of these tools actually have neighborhood data what tools are you all using to get comps in the same neighborhood? 

I understand I will not be able to leverage some of the tax benefits available to traditional landlords while I am renting to her and want to understand 1) what I am missing out on and 2) any legal, creative ways to access the rental tax advantages.Thanks for your thoughts!

I worked for years in DoD locations where personal cell use and email access was restricted.