question about max number of mortgages

[Sunny P.]

I was just talking to a lender and he mentioned that at most one can have 4 mortgages under their name.  How do some investors here have like 10-20+ properties all with mortgages? I don't see a big point in real estate to invest if you can't leverage.  

I currently have 3 mortgages and I was potentially looking at a place and that would put me at 4 mortgages total and then how would I buy more?   I know brokers and private investors exist out there but the loans are much more expensive.  

Any suggestions..ideas..thanks