I'm looking for advice or recommendations for seminars and boot camps on single family and small multi family ( 4-10) unit investing.

Maybe consider investing in multi-family B-class properties.

Pay an early termination fee with 30 days notice.If they voluntarily choose option #2 then there's no risk of them complaining to anyone, particularly the legal system.

In the Cambridge-Somerville area, triple deckers in need of repair easily go for multi-millions, you need a lot of capital upfront for downpayment and rehab costs and you are relying on appreciation to build equity - the flip and condo conversion is a popular option in these areas. 

You start your investing with multi or whatever but separately.

So, Decide which kind of investor you want to be (SFR, Commercial, Land, Tax Liens, Passive, HML, Multi-Family, Notes, Fix & Flip, Buy & Hold, "Subject To", apartments, duplexes, assisted living, REOs, Foreclosures, Short Sales), etc.

But, I was hanging out with people that were both single family and multi family investors.  

CA benefits from a glorious past with tech industry and entertainment industry to name a few, that were built before CA became effectively a one party system; and this "People's Republic" unfortunately also "occupies" more than half of our beautiful West Coast with prime real estate.

IE. heating system, roof, windows?

Case in point we inherited 4 tenants in a multi.