Gambling devices shall be operated and raffles conducted by a licensed organization only upon premises which it owns or leases, except that tickets for raffles may be sold off the premises. Leases shall be in writing and shall be for a term of at least one year. No lease shall provide that rental payments be based on a percentage of receipts. A copy of the lease shall be filed with the City Clerk/Treasurer. The Council may in its discretion waive any lease requirement as set forth herein.