For instance, getting your roof replaced here in North Texas can be much cheaper in the winter, because the roofers are not as busy. 

I've fixed pretty much everything unless it was over my skill set (replacing capacitor on A/C system, for instance; landlord told me when I moved in it was okay to repaint or whatever as long as it improved the house), my neighbors love me - they've told him so; I've resodded the yard twice (FL grass sucks with a dog), had the landscape crew redo the trees in front so they look good, replanted flower beds (perennials), power washed the house every year after wet season ended, ensured the pest control worked...The BUT part ...As a sole practioning consultant (pre-IPO weakness remediation, large financial systems implementations, global audit recommendations for SEC registrants, etc.) at times during the last 3 years things have been sink or sink lower credit wise and the ID theft didn't help (apparently, I bought a car in GA and own some property in TX).

For instance, https://resolute.fund/ is a collection of distressed real estate that can be purchased globally.

For instance Sole Propertierships do business under the owners legal name but hide this by using a DBA. 

Due to overpopulation in Miami, developers are moving further South and there is rarely instances of developers not completing projects here in Miami. 

For instance, at the far limits of what this society tolerates in terms of violent behavior is the local police and their weaponry.

Realtor.com has an overlay when looking at listings that shows the amount of crime an area has, it is broken down by city blocks in many instances.

@Wei WangIt depends on the state, and you did not disclose yours.For instance, here is an article about doing this in Texas.

@Joshua Penners  If the tenants have signed previous leases and had uninterrupted occupancy of the property and continue to pay rent per the terms of the previous lease and their actions are consistent with the previous lease terms (for instance you have a $50 late fee in a previous  ease and they pay that now even though technically there is no new signed lease) then just about any court will deem them to still be subject to the terms of the lease signed or not .

For instance, this 10% Vacancy that you are calculating monthly is generally passed along as an added cost to the tenant through a security deposit.