On December 1, 1982, the plaintiff-sublessor, using a lease form its attorney had prepared for a prior tenant, entered into a sublease arrangement with the defendant sublessee for approximately 6500 square feet of a commercial building, with a total square footage of 35,000 square feet. The sublessee obligated itself to pay the following: (1) monthly rent; (2) five percent late charge on monthly rental charges not paid by the seventh calendar day of the month. For each seven-day period thereafter, the sublessee incurs an additional 5 percent late charge; (3) sublessee’s proportionate share of sublessor’s expense in maintaining fire and extended insurance coverage on the building and improvements of the demised premises; (4) all water, gas and electric charges when due; (5) sublessee shall pay its proportionate share of real estate taxes as and when billed by the sublessor; (6) sublessee shall pay, as additional rent, its proportionate share of the cost of maintaining the common areas, roadways, parking lot, walks and grounds of which the demised premises form a part.