offering in cash

[Jasmine C.]

I am looking to see what a fair offer price under asking would be for a portfolio of 10.  the asking price is 50K each.  if I offer for cash on the entire portfolio how much of a discount should I ask for?  Homes are all rented and under pm.  no major fixes or vacancies.  This is an off market deal but a realtor in the area gave me comps and said the market price is in the low 50s for each.   just trying to see what is a fair offer without looking like a low baler.