Proper, Cbiz and Foremost.Foremost was much cheaper for me.

You could go turbo tax and do it yourself for cheaper...

You may find that a CPA in another state will work for cheaper because cost of living is cheaper, but be sure they are familiar with the complex CA laws if you are going out of state.

Do you think this is just a phase and eventually young professionals will migrate to cheaper cities where an apartment can  be had for the price of a room in Boston?

I have never tried to buy one because the prices are so inflated.I can buy single family houses cheaper than the per door cost of a MH park.Now if someone was willing to owner finance the whole park and it would cash flow then I would be all over it.I have been using my self directed Roth IRA to buy houses for cash to generate tax free income.

You could do a cash-out refi on the car you already have, and that would be cheaper.

House hack in a cheaper area (I'm currently in California), use 3-10% down on a primary and have a bunch leftover to play with.

And I should know this but is it cheaper to do a rate term refi than a cash out on the 2 new rentals?

Online would make it easier for virtual bookeeper but there are other ways to handle it if you buy the desktop version also which is a little cheaper. 

i would go the cheaper route