|  *Maintenance and repairs are incidental costs 
                  that keep a property in ordinary working condition.
 **Additions and alterations to property outside the structure 
                  include walks, driveways, walls, fences, pools, garages, sheds, 
                  etc.
 ***Additions refer to actual enlargements of the structure.
 ****Alterations refer to changes or improvements made within 
                  or on the structure.
 *****Major replacements are relatively expensive and are not 
                  considered repairs and include furnaces, boilers, roof replacement, 
                  central air conditioning, etc.
 Source: Bureau of the Census, Department of Commerce
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