There is a large "bow", if you will, in tow of the brick walls on the exterior of the house in the basement.

They get scratched, liquid spills will cause it to bow, over time they start bowing just because of general moisture in the air.

this past year, being at a new job, my bosses opened my eyes to the world of investing and compounding interest. 

that is really the main metric you can use.. the turnkey companies can only manage the properties but they cannot be in the assets 24 /7 and you get a bummer tenant and you now have an asset that does not perform as expected.. its not the turn key company its the Tenant that is the main cog in this.Also I have seen very poor owners over the years that have no business or clue how to be rental property owners.. they do not know or cannot imagine how others live and they freak out when some little thing happens and will bow their back on tenant issues only to have said tenant leave and create a vacancy.. and any vacancy is going to cost you money and ruin your numbers for that year.

I've refocused to a smaller, 2 building compound.  

Essentialism and The Compound Effect for mindset.

A very common structure is for you (the general partner or GP) to offer your investors (limited partners or LPs) a fixed annualized non compounding preferred return of say 8% of the investors invested capital.

When you compare on an absolute basis it does not appear to be so bad, but relatively speaking 20% is a huge difference, especially when you compound that over 30yrs.

Perhaps you guys can tag team this compound question.

I think Roth IRAs were touched upon briefly in this thread but I wanted to emphasize what a big believer I am in the power of tax-free compounding interest in a Roth IRA.