You literally know nothing other than what you've read and think you have the full picture.

There are not any pictures of the inside.

If you do postcards, you can actually use ones that have a picture of the owner's house on them.

You will own a property that has these risks and 100 more:car falls on leg of customer and he is young and incapacitated and sues you tootenant pours poisonous degreaser into public plumbing an it leaks 200 feet to neighbor properties, they sue yourobbery happens and child is trapped in the bay and survives, the parents sue youteen comes in with their helper dog who bites clients, they sue youfireman falls through the roof in a fire (chemical fire) and is disabled because the roof wasn't to code...Although you are only the landlord you have duties to health and safety of the employees, clients who walk in, and the community.Look up: Ng to the Ghost Ship landlord in East Oakland

I mainly do remodels, but occasionally I do custom builds for clients. 

If you take the MLS deals out of the picture, these off market properties are early 1900's, diverse in regards to investment strategies, and they meet the $150-$200 a door.

@Brock Mogensen, customized label for the wine with your logo?

Lawdepot.ca has basic agreements that can be customized, and these serve as a good starting point so that you know what terms need to be considered. 

Repeat customers is about 15 to 20%.

You could take a picture of it and text it to the correct recipient as evidence it's there and that you've not touched it, just in case it goes missing.