In somce other areas we have invested there have been zoning issues with the muncipality. 

Give some examples of the Italy issues.  

The issue I take with anyone looking for an app instead of building their own is that it misses the forest for the trees.

Tenant moved in the first week of December and there's been an excess of communication from the owners for somewhat minor issues or concerns.- Tenant submitted a work order for low water pressure in 2 bathrooms- Tenant submitted a work order because the garage door doesn't close all the way and left a 2-3 inch gap at the bottom- Owner initially refused to address either work order- Owner demanding the tenants place furniture pads on each piece of furniture- Owner calling multiple times to speak through the work orders, asking when they've been scheduled, calling a couple days later requesting the invoices- Owner calling because they want to access their storage in the basement so they can remove several pieces of furniture being stored- Owner now emailing requesting multiple property inspections throughout the lease cycle- Owner questioning my experience and relative PM knowledge because I'm not following up with her in a timely manner (the following day after the work order)Keep in mind, this is 2 weeks after the tenants had moved in and the tenants are very happy in the home.This is something we see on a regular basis.

Some hotels actually have a condo like structure, where people can own the units, but perhaps are limited on their personal use to only a certain amount of the year - the rest of the year it is in the rental pool managed by the hotel.If numerous room owners stopped paying their bills, you could get tax liens on numerous separately owned units.Hotels are a tough business, an issue I also see come up with them often is that they require refreshes, expensive and relatively often - at least once every 10 years, if not more often. 

It is a safety issue. 

If that is the case, can you start to buy places that are built in the mid-90s to stay away from those big issues?

As a 3rd-party real estate consultant that has no skin in the game other than what I charge, I provide exactly what you've described—unbiased, no-nonsense, and straightforward advice.

As a matter of fact, crime very rarely comes up as an issue with tenants.2." 

Multi-family properties many times provide a better return per square foot than single family, which would be to your advantage as well.As long as you're mindful of the reinvestment requirements and purchase at least as much as you sold and use all of the proceeds, you shouldn't have any issues with this strategy.