This excerpt taken from the FORM 10-Q filed Nov 7, 2006.
Tenant shall not place, construct or maintain on the windows, doors or exterior walls or roof of the Premises or any interior portions that may be visible from the exterior of the Premises, any signs, advertisements, names, trademarks or other similar item without Landlords consent, which consent shall not be unreasonably withheld or delayed so long as the signage Tenant installs complies with all Legal Requirements and the master sign program for the Center. Upon written notice from Landlord specifying the violation in reasonable detail, Tenant shall, at Tenants cost, remove any item so placed or maintained which does not comply with the provisions of this Section. Landlord agrees that Landlord shall not install or permit the installation of signs or billboards on the exterior walls and/or the roof of the Premises.
See Addendum 32.26.