"refi" with commercial loan?

[Scott McCurley]

i have 3 properties with residential mortgages at 4.9% (2 at 30 years, 1 at 20 years.) i am considering putting them all in a commercial loan for 3.65% interest for 15 years.  the commercial loan payment would be about breakeven (with today's rent and therefore removing the $700/mo current cashflow) so it would cut my cash flow to 0 for now, but put about $75k in my pocket for another cash flowing project.  I would also have 3 more "available" residential mortgages for future investments (i currently have 7 residential mortgages)?  and one more thing, this commercial loan would help establish a relationship with a local credit union which i hope to utilize in the future for funding my next local real estate 

these are A and B class single family homes.

thanks for your thoughts and comments.

Scott