Also, if the property appraises for 900k, would the 100k built in equity satisfy the equity requirement or does it have to be new money? 

My partner and I put in equity 50/50 and got hard money financing in the beginning to put less down, and then we either refinanced or 1031 exchanged into larger assets.

A hypothetical to see how people factor costs when rolling equity forward into additional purchases.For this example assume  you purchased property “A” for 100k, and put 25% down. 2 years later you sell it for 125k so you now have 50k (25k from your initial down payment + 25k in equity).

Do I have to put any down payment even thought seller has 30% in equity that he is financing to me? 

In it's current state, there is $80K in equity.

Some have more than $1 million in equity while others have less.4.

We have $100K plus in equity in the property, and $40K cash.  

I have about 200k in equity and a credit score of 804.   

-Current Assets: <$100k in cash, ~$300k in retirement accounts, Primary Residence (CA) ~$100k in equity, 1 LTR condo ~$200k in equity and a HELOC @ $80k to close this week hopefully :). 

At the end of one year I paid for an appraisal documented my 20%++ in equity and got my collaterals back.