Myself and partner have an apartment each,neither bought as investment properties but which are turning into them as negative equity prohibits sale.the negative equity isn't that large about 20000 in each and we are thinking of waiting until the neg equity is gone and then buy our family home.each property has excellent rental potential with rent covering capital and interest and I feel that they would be fantastic as a long term investment.we are currently living in the second apartment but as our family is currently expanding we will need more space but could hold on for a few years.what are the banks criterion if you want to hold on to investment properties and buy another