I think we're going to be able to strike an agreement to buy in as-is condition.This is my first potential deal, and I wanted to educate myself a little bit on what to do with code violations.The house has had many self-done add-ons by multiple owners since its original construction. 

As a rough budget you can plan on $150/sq ft for just the building with foundation, then add on the land and site work after that, which can vary greatly depending on the depth of the well, type of septic system (conventional, mound or pretreatment).

Generally, lower level investors try to preserve their costs by entering into limited servicing arrangements which will be a barrier to delinquency and recovery as delinquency and default notices are typically add-on costs to the servicing plan.  

A lot of users here being people who have never, and never will pull the trigger on anything, so they aren't actually ever taken by or encountering any scams and therefore don't have much to add on the topic.2.)

Last week we had a contractor add on a 10ft extension to our driveway.

To answer some of the questions, I'm looking to add one more apartment building 10 unitto my portafolio.

Add on a investment property when you're ready.

I'd also ask if they add on a service fee for when they make maintenance calls on your behalf to vendors.

Also is there any add-on that you may recommend?

To add on to what Curt and Dean said, multi family housing usually attracts a very low income tenant.