That said, these increases are baked into prices and cash flow is getting harder to find (but not impossible). 

I own rent contolled multi-unit in Los Angeles and increase rent yearly per RSO, but sec.deposits have lagged behind the rent.

The increased growth of professional tenants is spreading very quickly and unfortunately most legal systems enable them.

Their lease is up at the end of the month and I let them know WELL ahead of time that rents will increase by $50/mo which is still below market value BUT they are loyal long term tenants.

Okay I’m sorry I didn’t put the right calculation up the one I  meant to put up was 3.5 percent down at a 4.8 percent loan , another question I have is that the rent as off now is 850 for each unit and the deal won’t work unless I can increase rent up to 1200 per unit  the rents are low for my market but I don’t know if I should buy the property assuming I can raise rents 

I would like to come back to him and revisit the possibility one more time but I don't know what to offer him.Can you please help me with common interest rate, term, down and anything else that may be beneficial in getting him to be more interested.Do I need to increase the purchase price?

Being able to add-value should help you increase the value. 

This has lead me to strongly believe that Bitcoin, and a few other blockchain projects will become increasingly popular over time. 

I would then cash out the equity to move into flipping properties to increase the amount of hard cash I have on hand which I can then re-invest into more doors.

This method doesn’t help with your w2 now but as time goes on it doesn’t add to  the income  tax burden as income and equity increases.