Brokering real estate without being properly licensed is a violation of state law/code in almost every state.  

And by what scope (zip code?

Either of those zip codes could work. 

Sometimes local code mandates green board though.

Sometimes zip codes have transposed digits.

Code enforcement?

What is the best way to bring the old wiring up to code without breaking the budget by rewiring the entire house?

Some of that is just thinking "would I want to live in this house at this price" or more accurately "would my wife want this house at this price"I like redfin because you can get $/sq ft in the zip code, a good indicator.

I know that you can either find discount codes online or sweet talk the sales people in to lowering their prices.

Another flipped burgers.You'll likely be treated as a resturant and need to meet health codes as such.