Then California passed the law legalizing Accessory Dwelling Unit's (ADU's) in January 2016.

We want to add a garage to a 4plex but the city has re-zoned the lot to SFR use and says our property is legal non conforming so we are not able to expand.i think a garage is an accessory that is consistent with accessory's for a house,  so it should be OK to my thinking, Is there a tact full way to approach the city with this?

@Nathan ClaireThanks for the substance and silliness ;-)A modification/addition to the BRRR method I’m considering are ADU’s/Accessory Dwelling Units.

https://www.sanjoseca.gov/business/development-services-permit-center/accessory-dwelling-units-adus/adu-amnesty-programAlso, you could try speaking with a local architect like @Adam Mayberry. 

A SFH zoned for an accessory dwelling unit in Denver at that price?

Investment Info:

Small multi-family (2-4 units) buy & hold investment.

Purchase price: $350,000

Cash invested: $70,000

SFH with tons of deferred updates and zoned for an additional dwelling unit ...

:)An ADU is accessory dwelling unit, think a granny flat, in-law suite, guest house, etc.

This should also impact our plans on what we can rent (duplex and not accessory dwelling units) and the cash flow that I can get from the home.Also I've reached out to my current loaner and other lenders regarding my question for refinancing and buying as a first time buyer.

This sounds like a waste of your time so use it as a learning experience and use the inspection to get out of the deal.California passed a sweeping (applies to SFR and multifamily parcels) accessory dwelling unit law that took effect on Jan 1 that generally allows for conversion of any accessory structure or garage into an ADU and removes local jurisdictions' power to limit said conversions. 

Most people sign up based on closeness to home, how cheap per month dues, and amenities offered in base membership.The real money is private trainer sessions, vitamin and protein food shop, clothing and accessories etc.