First of all, it's simple - you can go to the government's site and check to see if the condo complex is on the FHA's APPROVED list (there's more to an fha approval than just the percentage of owner occupied units).
Here's the site:
follow the directions on the left side of the screen - there is a drop down screen, and you can put in your zip code for the list. The hours of operation for the site are limited (I believe) from 8 - 10PM Eastern Standard Time.
Your other, bigger concern - let's assume the condo is NOT on the FHA approved list, is that many lenders will not lend money if the financials of the complex aren't sound.
The lender you will work with can discuss this with you.
There is a "condo questionaire" that the management company usually has to fill out and return to the bank/lender - it will question, for example, the number of owner occupied units, as well as asking if there are any pending lawsuits against the community..........or the number foreclosures........how many unpaid HOA fees, etc.
Find a trusted lender and go over this with him or her.