Seller installed all new pex plumbing, circuit breakers etc.

Look at the major items:  roof, gutters, electrical, plumbing, HVAC, and floors. 

A roof, furnace, cabinets, new plumbing, etc improve the value of a house and extend it's useful life, which is why you depreciate them. 

We got the permits for the plumbing, electrical and framing and there's been many changes and some surprises...

The biggest part of the cost is the plumbing, and to give good estimates we would need to know your scope of work.

Cap Ex items are certainly worth checking out:- Age/Condition of roof, siding, windows, plumbing, electrical, HVAC (just to name a few)But also make sure that you are looking at location of the house!

But if the electrical has been updated, and the plumbing has been updated, and the roof is newer... than it should be easily insurable. 

While looking at one of David Greene's rehab projects in the same city (http://greeneincome.com/index.php/2016/12/01/alexon/), David paid $6.5K to have the property repainted, kitchen floor replaced, cabinets repainted, new doors installed, plumbing repaired, electrical upgraded, garage repaired, bathrooms refinished, new appliances and fridge installed, and some repairs made to a handrail.

Keep in mind the plumbing, electrical, and walls in a manufactured home may be different than what you're used to.From the internet....

Hello everyone, Looking for recommendations of a good licensed plumber/plumbing team near LR.We are remodeling a 32 unit apartment complex which is near its completion except for finished plumbing.