good question @Barshay Graves  ... i was a plumber many years ago and replaced a lot of galv. back then copper was the best option... these days pex pipe for water pipe is so easy to install plumbers are installing for less and makes a huge job of repipe not as much of a challenge. get your prices for waste and water replacement (pvc or abs pipe for waste)  (pex for water)  and shop around a bit. 

Take her shopping with you when you're choosing materials.  

I dont really know for sure where to post this,,,if it needs moved thats fine.I became aware for the first time about a year ago after googling Federal pacific breakers,,,as I was shopping for some double thin ones to stretch box space. 

I keep my RE brokers license in case I need to make commissions some day.. and my NMLS license is one Ice but I keep up with CE incase I want to start a HML shop again.. etc etc.

If someone always is making returns, "maybe, you would be better off shopping elsewhere?"

Then, you just shop for properties which are not listed yet and "fill your buyers' orders".

I almost bought a house like this, and got two bids, the lowest was $3k, but I would have shopped harder if the deal had closed.

For instance, my dad rented space to a barber shop, and over the span of 25 years, to a succession of barbers.

I came across an awesome-looking fixer upper in a very solid neighborhood right off the train and near a bunch of shopping, etc.  

See what sort of rents (and occupancy rates) similar homes in your area go for (secret shop by asking that you need to see it for a family member).