shall agree, provided however, that all of the adver- tising units shall be and remain the sole and exclu- sive property entitlement of the Lessee herein. It is understood and agreed by and between the Parties hereto respectively that all advertising material respecting or dealing with alcohol or tobacco products are hereby expressly prohibited and shall not be placed in the demised premises. The Lessee further agrees to, and shall erect and install one (1) Challenger Scoreboard Clock, Model No. H-3214-4-10PT, in each Arena, and one (1) Read-O-Graph Marquee in the lobby common to both Arenas, and IT IS HEREBY DECLARED AND AGREED that the Lessor shall have the exclusive right-.to purchase each and both of the said Scoreboard Clocks and the Read-O-Graph Marquee on or after the Ist day of July, A.D. 1979, upon payment to the Lessee of the sum of One ($1.00) Dollar for each said Scoreboard Clock and One ($1.00) Dollar for the said Read-O-Graph Marquee. The Lessee shall have the further exclusive right, benefit and entitlement to the use and the placement of all advertising areas and surfaces as shall be sold and agreed to by and between the Parties hereto, and, without limiting the generality of the foregoing, said areas and surfaces as shall be cn or around the ice perimeter bcards, or on or about the chattels known as “Zamboni" ice cleaning machines, and the surface area on, about or surrounding the face of any clock or score-keeping devices which. may now or hereafter be. located in or about the demised premises, provided however that no advertising displays shall be placed by the Lessee on any coffee bar equipment or other related food vending machines in or about the demised premises.