We are contracted to do work outside of (and around) condos (bldg common areas). Who would need to sign NOC?

We are a soils & foundation stabilization contractor doing work around outside of each building in a COA community. Technically, we are not working for unit owners, rather for the "Association" since I believe that the property outside of and around the building would be considered common areas owned by the "Association". Would each unit owner for each of the buildings need to sign NOC?