That could add up quickly and might be difficult to do. 

Because intrastate (single state) offerings must still comply with that state’s securities laws, and because with the internet its difficult for offerings of any size to be limited to investors residing in a single state, the exemption for private placements is the exemption from registration most often used. 

Getting rid of urine smell is very difficult and very costly.

After spending 25 years as a Software Engineering and Product leader, I’m now exploring the world of real estate investing (REI) and looking forward to learning from all of you.My goal is to leverage my current investments and savings to build a real estate portfolio that will eventually allow me to transition away from my current career.

This could be very difficult if you are going to self-manage, as you will be turning units every year and dealing with a lot of repairs.

Raising the  amount required to buy your target properties is not easy, and beyond the amount that must be raised without leverage it will be difficult for you to provide favorable return profile for your investors.

The squatter possibly has warrants on him and will be difficult to locate. 

.: Quote from @Chris Allen: Long story short, I am in a difficult situation with a property of mine and need to get rid of property.

Once you have family and get a bit older, house hacking gets difficult. 

First you have to face the local municipalities & will be extremely difficult to get the zoning approved.