Spondylosis is Osteoarthritis, so lumbosacral spondylosis would be osteoarthritis in the lumbosacral area of the spine. Here is a link to an article about cervical osteoarthritis, which is similar. http://www.webmd.com/osteoarthritis/guide/cervical-osteoarthritis-cervical-spondylosis.
MOTOR CONTROL CENTER. A motor control center consists of one or more vertical metal cabinet sections with power bus and provision for plug-in mounting of individual motor controllers. Very large controllers may be bolted in place but smaller controllers can be unplugged from the cabinet for testing or maintenance.
Class B buildings should generally not be functionally obsolete and should be well maintained. Class C The lowest classification of office building and space is Class C. These are older buildings and are located in less desirable areas and are often in need of extensive renovation.