Shall I refinance with this commercial loan?

[Johnny Situ]

I have 8 properties, the mortgages are all in our personal names, the term are around 5.5% for 30 years. I got in touch with a local small bank which is willing to do a portfolio loan for 4.85% over 20 years, but it has 7 year balloon payment. I am fine with the term and fees but I am not sure about the ballon part, which forces us to refinance or sell off the portfolio in 7 years. What do you think?