The building (from memory stone built rather than brick) stood through the depression of the 1930s.
Lets hope your work helps the building (and of course your business)  survive the present recession before it too becomes a depression.
It is interesting how buildings from that era, once judged hopeless for modern offices with all those windows letting light on to computer screens, are now often more comfortable and energy efficient than anything built since 1970.
Look in the cellars for where the old boiler was -- it will probably make a good place for your standby generator.  Talk to the Nigerians to get the best system....