How to get more than 10 financed SFR properties

[Tom Thomson]

Currently my wife and I live live in Indiana and have a 8 single family homes financed on 30 year fixed conventional loans.  7 of the 8 are investment properties and I would like to keep adding  2 or 3 a year but I was just notified by my lender that I would not be able to finance any more than 10 homes.   I love single family rentals as they have worked out well for us.   The only way I know to go over 10 is to jump up to a 5 unit or more multi family building where I can have a commercial loan vs. residential.  Anyone out there ever ran into this road block?  Any advise would be greatly appriciated.