Clarification needed on FHA requirements for condo associations

I am a retired Realtor and husband is President of our Self Managed Association of 52 condo's in Ohio. I was looking up info on number of rentals allowed by all mortgage companies for buyers to obtain a mortgage. Think I have been confusing the 15% for delinquency's and using 15% for allowable rentals. I read in a response stating FHA requirements for overall approval, that even FHA's requirement is 50% or less. Can someone please clarify? We have recently gone over the 15% and were concerned.Am hoping for the 50% or less! Also I commented at one time about the help I had through my RE office mortgage company that walked me through the approval in the past. Now am ashamed to admit I let it lapse! We had a major fire the year it lapsed & I had no one to walk it through that time...and too much confusion with fire handling to even attempt. Now another question...do I remember correctly that FHA no longer allows a one time approval? I forget what they called that? Thank you, Ann, Ohio.