Craigslist is a common place people search for small commercial spaces.

Just educate yourself on the model and common practice.

These kinds of loans are common, but there are a few things to keep in mind.

Is this common for the principal amount to increase this dramatically?

You can also put in leads from inquiries etc and out them through campaigns as well... keap is much easier than infusionsoft and geared toward small businessOriginally posted by @Daniel Dietz:@Chris Seveney I have been looking at CRM/Management  Apps for my 'day job' of running a kitchen and bath remodeling business. 

Seller financing is actually very common, and there's tons of info here on Bigger Pockets about it. 

No biggie, it’s fairly common.

Also see these:Real Estate WholesalingIntroduction to Real Estate Wholesaling | BiggerPockets Podcast #91The Ultimate Beginner’s Guide to Real Estate WholesalingA 60-Day Action Guide to Wholesaling Your First PropertyThe Newbie’s Guide to Wholesaling in 7 Simple StepsThe 8 Most Common Lies Newbies Believe About Wholesaling5 Costly Pitfalls That Catch Wholesaling Newbies Off GuardWholesaling CalculatorBest of luck to you!

The 50% rule is valid, and used by experienced investors for deal analysis because it works, and is surprisingly accurate across a wide spectrum of properties: https://www.biggerpockets.com/...It's common for listing agents to paint a rosy picture of a property's performance. 

While you can certainly send tenants an account statement, or notice showing what they owe, be very cautious about sending a pay or quit notice (we commonly call it a 3-day notice here in Florida), or any type of notice that mentions or threatens eviction.