Depending on the age and material of the pipes, it is entirely possible for them to "burn" clear through the drain line, creating leaks that will require replacing pipes hidden in the wall or under the floor.

Galvanized Pipes/Plumbing (insurable but the suckers corrode from the inside out and burst without warning).3.

Long story shorter I went into the crawl to make sure it was vented and found out the laundry room drain, shower and kitchen sink were draining into the clay pipes that lead to the drainage tile.

Next up is doing the same leveling/beam replacement in the hall bath and reframing the 2X6 wall that seperates the kitchen and hall bath that houses plumbing vent piping.

@Ryan MorganNot an exhaustive list but see below for some ideas:Regional banks/credit union: Compared to national banks, regional banks/credit unions can have less onerous terms.

your freon is low and the only reason is due to a leak, best to get a new system"I said if it's a leak in the pipes from outside to inside then a new system won't help at all."

I thought it sounded like the pipe got clogged.

Larger pipe just means the pump doesn't need to work as hard, but 1 1/2" is fine too. 

They'll lay perforated pipe in the trench with each piece of pipe slope to one location of the basement. 

@Tyrone MarsonI think @Randall Alan had a lot of great points.If you manage them yourself, give them expectations upfront when are appropriate times to contact you for non emergency items, what constitutes an emergency which for us was largely active running water like a pipe break (go over location of cut off valves with them at move in) and loss of heat over winter.