@Ella Marie, I can't speak on behalf of your market, but in my respective market, competition is tough, and the successful fix-and-flip vendors are often full-time operating businesses.

While I am not in San Diego, I spent some time out there last summer (Ocean Beach) and loved it!

I go on MobileHomeParkStore.com and search my state, and also Loopnet.com and search under multifamily filter mobile homes.Once you find something and fell good about it, write it up and get going.I'm planning a trip to Bentonville, Arkansas in May, It will be my 3rd time there.

Over the course of using Bigger Pockets I have had very degrees of opinions on who I should vote for concerning a post.When I first started using Bigger Pockets, I was too naïve to even think of voting for someone that took the time to answer one of my post.  

Walkable to locally owned restaurants and the street had mostly owner occupied homes that are owned by long time owners.

All the best to you during your last semester.Househacking is one of the most common routes for new investors in NY.For best returns, I'd recommend focusing on South and Southeast Queens, Central and Southeast Brooklyn, and the Bronx.There are parts of the suburbs (Westchester and Long Island) that have househack opportunities but the property taxes are higher and the commute time to NYC is longer.Abel

If you've dealt with this how much did it cost and how much time did it take to resolve it?

I do not understand your remark as related to the DSCR loan.  2 ADUs are not allowed by f/f conventional financing but is not always enforced.Fortunately if you stay with the current tenant without a refi, by the time you pay principle it is likely the rent will have increased enough to absorb the increase mortgage payment. 

You've done well with your Class A rental, generating $500/mo in cash flow, this adds up over time.

I’m aware of this happening once previously last summer, but thought it was a one time accident.