C»Topics» Calculation of Overtime HVAC Charge

These excerpts taken from the C 10-K filed Feb 22, 2008.

Calculation of Overtime HVAC Charge

 Equipment KW Cost to operatehourly at\$0.18kwh 2-Supply Fans 45 \$ 8.10 1-1350 Ton Chiller operates at 866KW (operating at 146 Tons per floor=102.2 KW per floor based on .7kw/ton) 102.2 \$ 18.40 1-Chilled Water Pump 114.6 \$ 2.23 1-Condenser Water Pump 188 \$ 3.66 1-Cooling Tower Fan 53.3 \$ 1.04 Ancillary Equipment \$ 6.00 Total HVAC Cost /Hour/Floor 503.1 \$ 39.42

*** This cost is based on chiller already operating on a 24X7 basis to supply Chilled Water

*** Utility rate is based on \$0.18 kwh but should be adjusted on Landlord’s average blended rate for electric power then in effect

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EXHIBIT L-1

Calculation of Overtime HVAC Charge

 Rate EXAMPLERate 2004 Water Consumption (A ) \$ 0.0256 \$ 0.0256 Electric Consumption (B ) \$ 0.1029 Ton Hour Cost = (A)+(B) \$ 0.1285 x Floor HVAC unit capacity in tons per hr 60 60 x Overtime HVAC diversity factor 0.50 0.50 = Charge Per hour \$ 0.0000 \$ 3.8550

 (A) Water Consumption rate represents the cost for makeup water for 1 ton hour of chilled water. The cost will remain constant during the lease term as it represents a de minimis increase.
 (B) Electric Consumption rate is equal to \$.1029 + ((Avg Cost per KWH - \$.1175 / \$.1175) x \$.1029) and represents the total cost for electricity to make 1 ton hour of chilled water.

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EXHIBIT L-1