How about someone under 21 having a credit card or drinking alcohol?

PPC and other expensive ways of sourcing leads is usually Phase II or III of a business plan, once someone has a robust pipeline of deals via cold calling and/or SMS. 

Tiller uses Yodlee to handle encrypted logins, maybe their connection to banking data is more robust than Stessa's free version. 

If there are a lot of neglected yards, the area is full of either renters or alcoholics.

Salesforce can be very robust and we hired an outside company to customize it for us which was relatively inexpensive.

Not to scare you, but I did share a post here of a tenant that literally hacked his landlord when she went to address something with him after she had already indicated eviction proceedings.The landlord ended up in ICU and I did not follow the story enough to know if she lived.The article indicated that even if she lived, she would be left with major brain damage.Once eviction papers are served or termination of tenancy communicated, I would be very careful about going around said tenant as emotions are high and worse where drugs/alcohol is involved.I would for the most part keep away and handle this per the advise of your attorney.Did an eviction once of inherited tenants that a year and a half later, continued to challenge my policies and damage the unit, and it was tough, but seems that eviction (at least once especially with inherited tenants) is just the rite of passage most landlords have to go through.Not saying you will, but as @Marcia Maynard says, please be safe.

@Karen Margrave crushing college debt, delayed adult decision making, chronic alcohol abuse, pushed political agendas.

I can use guidance in choosing a target city in Northwest Indiana, referrals to assemble my team (especially a very well qualified real estate CPA), and to let me know of local meet-ups near the southwest suburbs of Chicago where there are robust discussions regarding investing over the border in Indiana.

A robust job market fosters increased demand for housing and rental properties.Affordable Housing Market: Compared to many other major cities, San Antonio's housing market offers relatively affordable property prices, making it an accessible option for investors looking to enter the real estate market.Strong Rental Market: San Antonio has a significant rental market, driven by a growing number of renters and the presence of military personnel and students due to various universities and military bases in the area.

Did you know:-  The wall between units should be a FIREWALL and is significantly more robust than any room partition wall.