We rent the boats with a captain, and meet the renters at the lake, take them out, teach the participants to wake surf, wakeboard, kneeboard, or go tubing. 

Plumbing by-passes or abandoned lines; collapsing sewer lines; badly corroded supply and waste lines (both can be from inside or outside corrosion) fixtures with very hard to find components; hidden electrical junction boxes...or non-existent boxes at junctions; outdated and/or underrated distribution panels; knob and tube wiring improperly connected to, or extended with, romex; Switches wired incorrectly, breaking the neutral instead of the hot side; no, or poor grounds for improper outlets; overheated connections, outlets, switches, and light fixtures; improper wire sizes for circuits and overloaded circuits; and plenty of others...all very costly to troubleshoot, locate, and correct individually.

Lead paint, asbestos, galvanized pipes, cast iron waste pipes, knob and tube wiring, ancient HVAC systems, and windows that need replacing.

@Wayne Brooks  Oregon is really starting to enforce these laws that have been on the books for ever.basically they are now aware of all the guru and training U tubes out there on how to wholesale.I had a chat with an enforcement officer this week..

Take each item and go through the free resources on BP, You Tube, and your local library.

You tube channel? 

Filming porn, massage parlors with happy endings, etc.

knob and tube wiring/2-prong outletslead or galvanized water service lineancient mechanicalsancient windowscracking/broken/termite eaten floor joists in basementand so many more....none are deal breakers but each can be expensive to fix and several together can be a budget buster.

If it has old cooper fittings like a fill tube those may have a hairline crack but again not a water bill like that!

Manly men, as opposed to girly men).Kegorator, electronic darts, poker table w/cards & chips, BluRay player and a collection of porn, Roku or smart hdtv, gas grill & charcoal grill, suit of armor, life size stand up picture of Marilyn Monroe, .22 cal pellet gun with pellets and pigeon/starling/squirrel bait and a critter count score board, horse shoe pit, firepit with several tons of firewood, that's all I can think of right off the top of my head.