if you use a Class 4/hail resistant shingle (costs more!)

Upstairs deck.  2.5 blocks from the beach.  10 min car ride to Atlantic City.  20 min car ride to Ocean City NJ. 

You will need to know factors such as economic trends, population shifts in or out, state laws and local laws (landlord friendly vs tenant friendly etc)... physical property hazards by season (flooding, rain, hail, fire) or in general (ie I personally can't fathom investing in New Orleans unless it was to AirBNB for the short term and then sell the property)   - If you can narrow down to one or two states, then I would look for "where are the tenants I want to deal with located" theres so many ways to answer that question but you may want to start looking in a major metro area... most states have less than 10 major cities or areas of decent population density. 

Looks like the seller is trying to find someone to hold the bag on the property and then said seller will ride off into the sunset with the money of some unsuspecting buyer.

I also came up with ebike/scooter docking stations, air fill up machine, fleet and/or ride share storage. 

Depending on the type of deals you buy, having 3 paid off could be more cashflow each month than 15 with mortgages.But if you are at a point where you are investing largely for appreciation, it makes sense to take on leverage to get more properties so you can ride that appreciation wave.

@Michael Mackney, if the property is cash flowing, ride it out a few years while you save cash to pay for the upgrades or to pay off the mortgage.

We have sunroofs in our primary and we get some hail but no big stones.

And was gonna start a ride company.

If you cater to families why not some fun sized as well so they can all defend the homestead, no free rides for the kiddos but make sure they are on their level.