Basic plumbing, electrical, HVAC knowledge will go a long way.

Currently I had borrowed 12.5k to consolidate credit card debt and I can borrow up to 23k. 2) Would it be wise to roll this into my home mortgage so I can get the tax break for the interest and allow for more borrowing power from a credit union?

Gas, electric, cable, internet, and water.

It is a very simplistic way to get people to understand the power of investing.

Here are the numbers I know so far:Rents4 units all currently occupied on one year leases- #1: 1/1 $995 monthly- #2: 1/1 $995 monthly- #3: 1/1 $995 monthly- #4: 2/1 $1,100 monthly- Gross rents: $4,085 monthlyExpenses- $12,070 taxes annually- $350 monthly insurance (my estimate, they have liability only right now)- $175 monthly landscaping- $120 water (electrical on separate meters, tenant pays)- Total expenses: $1,651 monthlyNOI around $2,434 before vacancy, maintenance, and management (although i would likely self-manage these)Property needs about $50K in other repairs and udpates from what I can see.

If the USD looses half it's value, thus loosing half it's purchasing power, what do you think the DOW would change in response? 

@Matthew Edmondson, the power of google key word searches.  

This can be a great way to concentrate your equity in order to be able to make a later cash out refinance as powerful as possible. 

Quote from @John Williams: I would only support this because it's California where electric cars are most likely to be mandated and used.

"Then he wanted to redo the placement of the electrical outlet for the appliances stove, fan, above stove microwave.