Tara,
Typically for an Association to have rental limitations, the language needs to be contained within the CC&Rs. However, every State is different and, until challenged through the courts, rental limits in other documents could be enforced.
Rental limits in condominums is seen more often than within Associations.
Things you should ask your Board concerning the policy:
Grandfathering - since my unit was purchased prior to the policy being in effect, will you be grandfathered?
Hardships - Are there allowance for hardship waivers to the policy? What will the Association consider as a hardship (specifically) and how does one go about obtaining a waiver?
Rotation - What policy and procedure is in place to rotate the ability to rent once the 10% cap is reached?
Lease length - will the Association only allow a specific length of lease (12 month vs. 6 month or 24 months)? How will that lease length be utilized when deciding the rotation of the ability to lease?
Enforcement - how will the Association enforce such a limitation if someone won't stop renting so another may rent?
Authority - What section of the CC&Rs or State statute authorizes the Board to establish a rental cap?
Amending Documents - Will the Board be attempting to limit rentals by amending the CC&Rs (as this is where such limitation should be) or will the Board be amending a different document? If a different document will be amended (Bylaws, etc.) has the Board sought legal opinion to see if such a limitation would be in conflict with the CC&Rs and open the Association to potential litigation when trying to enforce any rental limitation? May I see that legal opinion?
Here is some more info:
Lease restrictions limit condo owner's options
October 25, 2012 from the Chicago Tribune
Association Restrictions on Leasing from an IL attorney site
Hope this helps,
Tim