Are there separate gas, electric and water meters for each apartment?

Check w/ the City / County to see what the permitting process is, and what if anything you would have to do regarding plumbing / electrical.

Are all 4 units metered for gas and electric separately or on master meter? 

The entire project took around 3 months with EVERY square in minus the electrical( some added) being gutted and renewed.

I just had a vacancy come up in the middle of a fourplex escrow and the seller had the unit re-rented in under a week for $50/more per month. 6) Yes it's hot, but with individual metering the landlord doesn't foot the electric bill 7) Yes the market is competitive here, but mostly for 3/4 unit properties.

Can you replace furnace, stove, etc with all electric and save 300 to 400 a month there? 

Quote from @Deandre Brown: When analyzing deals, a few additional factors I like to consider are whether the electric and gas utilities are charged per unit or as a single expense.

Quote from @Gary Aragon: Quote from @Rick Albert: Our electricity is already separate and we designed our ADU to be all electric so no gas. 

For sure PG&E requires this for gas and electric, and I think most jurisdictions require it for water and sewer as well. 

You can take it to private massaging if you want to avoid posting about it.