While it is true that you do not have the right to approve or disapprove, and regardless of if they are buying a sponsor unit or not, they will sign a Proprietary Lease, and subsequently must comply with it. and it's subsidiary documents (Bylaws and House Rules, etc). Only exceptions are if the Offering Plan specifically states that they are exempt from this rule.

I have a Shareholder in one of my buildings that had the same "health issues" with carpeting due to allergens, off gassing and a number of other things, but we did work together and find a non allergenic, all natural carpet that she was happy with.

Good luck!

~AR