C A P I TA L E X P E N D I T U R E S , T E N A N T I M P R O V E M E N T S A N D L E A S I N G C O S T S The following table shows total and weighted average per square foot property-related capital expendi- tures, tenant improvements and leasing costs (all of which are added to the basis of the properties) relat- ed to our life science properties (excluding capital expenditures and tenant improvements that are recov- erable from tenants, revenue-enhancing or related to properties that have undergone redevelopment) for the years ended December 31, 2004, 2003, 2002, 2001 and 2000, attributable to leases that commenced at our properties after our acquisition.  (1) Major capital expenditures consist of roof replacements and HVAC systems that are typically identified and considered at the time a property is acquired. Major capital expenditures for 2003 also include one-time costs related to the implementation of our national branding and signage program. (2) Major capital expenditures for 2004 include a one-time HVAC system upgrade at one property totaling $1,551,000 ($0.25 per square foot in  portfolio).  (3) Major capital expenditures for 2003 include $1,072,000 ($0.19 per square foot in portfolio) in one-time costs related to the implementation of our national branding and signage program. (4) Recurring capital expenditures for 2002 include $552,000 ($0.10 per square foot in portfolio) related to a fully leased property in San Diego, California that underwent substantial renovation in 2002. (5) Excludes space that has undergone redevelopment before retenanting.  Capital expenditures fluctuate in any given period due to the nature, extent and timing of improvements required and the extent to which they are recoverable from our tenants.Approximately 91% of our leas- es provide for the recapture of certain capital expenditures (such as HVAC systems maintenance and/or replacement, roof replacement and parking lot resurfacing). In addition, we maintain an active preven- tative maintenance program at each of our properties to minimize capital expenditures required.  Tenant improvements and leasing costs also fluctuate in any given year depending upon factors such as the timing and extent of vacancies, property age, location and characteristics, the type of lease (renew- P 14 Total/Weighted Average 2004 2003 2002 2001 2000 CAPITAL EXPENDITURES: Major capital  expenditures  (1) $ 5,974,000 $ 2,628,000 (2) $ 1,632,000 (3) $ 959,000 $ 616,000 $ 139,000 Recurring capital  expenditures $ 4,821,000 $ 1,243,000 $ 853,000 $ 1,472,000 (4) $ 614,000 $ 639,000 Weighted average square feet in portfolio 26,912,194 6,123,807 5,708,635 5,499,660 5,131,176 4,448,916 Per weighted average  square foot in portfolio Major capital  expenditures (1) $ 0.22 $ 0.43 (2) $ 0.29 (3) $ 0.17 $ 0.12 $ 0.03 Recurring capital  expenditures $ 0.18 $ 0.20 $ 0.15 $ 0.27 (4) $ 0.12 $ 0.14 TENANT IMPROVEMENTS  AND LEASING COSTS: Retenanted space  (5) Tenant improvements  and leasing costs $ 5,363,000 $ 713,000 $ 2,890,000 $ 498,000 $ 466,000 $ 796,000 Retenanted square feet 973,391 142,814 248,488 318,642 151,161 (5) 112,286 Per square foot leased  of retenanted space $ 5.51 $ 4.99 $ 11.63 $ 1.56 $ 3.08 $ 7.09 Renewal space Tenant improvements  and leasing costs $ 2,143,000 $ 937,000 $ 105,000 $ 526,000 $ 451,000 $ 124,000 Renewal square feet 1,751,822 558,874 271,236 255,978 432,717 233,017 Per square foot leased  of renewal space $ 1.22 $ 1.68 $ 0.39 $ 2.05 $ 1.04 $ 0.53