Fannie Mae and Freddie recently limited 7% of their portfolio to be investment/second homes so this has caused rates to increase for Conventional investment properties. 

However, my broker is limiting anything under 100k now.

You will be limited to 75% of ARV.

We are doing this with a portfolio lender and paying a bit of an interest rate premium as we are over the limit for Conventional financing. 

I've tried perusing the California tax laws and it taxed my limited brain capacity, so I had to give up.

Only limiting it to 3 things is tough but I’d say the 3 most important things I’d recommend to newbies are:1.

Along these same lines, an app like Venmo may work with a prepaid card (registered to a network brand like American Express, Discover, etc), but the issue with the daily/monthly send limit would be an issue I think. 

James Kleimann of HouseWire reports that starting April 1st, a number of new restrictions will take place including a 7% limit on Fannie Mae’s acquisition of single-family mortgage loans secured by a second home and investment properties.

However you may have limited time to make a claim.

So far I've checked with one and they don't offer an FHA Loan and for conventional you need 25% down for a triplex whether it is primary residence or not (unless you go Home Possible but I don't qualify because they have income limits).