I am looking at a 2.2 million complex and with only capital of half the down payment for 20%, curious if there are loan products to bridge the gap or make a larger purchase more realistic (minus getting additional funding).Thank you!

It was a larger project than anticipated.

For duplexes or larger, I'm not aware of any programs currently. 

On rentals, making them "durable" is a larger consideration.

At the time of shopping (2012-2013) I wish I bought a duplex or larger.

Or other problems with liquidating down the road to try and invest into larger real estate?

I'd guess so - I got mine funded in Sept 2017- I had 3 choices from the lender -- 3 yr rate lock, then adjustable, (either 5 or 7 yr rate lock) then adjustable or fixed for the life of the loan (25 yrs)5% at that time was what they were willing to do for the 3yrs, 6.75% was what they were willing to do for fixed for the life of the loan - they were one of the larger SBA lenders Id presume and kept it in house.

Compare the two and in both cases, the total net gain is much larger with the CA investment.

For a larger portfolio of conventional assets, it is best to do that in a separate IRA.

But if you get into creative financing, larger deals than basic SFH, or have partners, then you will definitely want to have one at the ready.