It's been years since I setup a website with PayPal payments, but they can in fact be integrated into your website somehow.

Social Media...

These agents I make note of, and when I see one of their open house signs in my neighborhood, I will stop by to chat with them.I don't work where I live, but we do employ direct mailers and out of all our marketing (print advertisement, social media, etc...) they by far provide the greatest return on investment.

If you have a name you can search social media for relatives and perhaps the owner as well.

This is what I have for my rent collection.4 tenants on automatic payments with cozy.co (pros: slick interface, integrated tenant screening cons: 7-day delay to get money)1 tenant pay using paypal friends/family (pros: faster than cozy, but extra management)3 tenants on automatic payment through Section-8 Housing3 tenants go to BofA branch on the first friday/thursday of the month and make a cash deposit (cash deposits makes it available immediately).

What is the integrity of the subfloor and structure - is there movement in the subfloor on the upper levels? 

Your integrity is on the line. 

Instead what they need to do to keep the integrity of the 1031 is to sell their investment property and do a 1031 for other investment property, treat it as investment and later convert it into their primary residence.  

I think it's best to use something that integrates with QB instead of an entire accounting package that most bookkeepers will not know.  

There is a concept in securities laws known as "integration" and, under this concept, two or more offerings--even if offered under different rules/exemptions--could be treated as one if they are too similar, too close in time, etc.