I had many contractor customers ranging from one man to 450 janitors. If you do commercial buildings, you pretty well must do floors. The old saying, if you want to get the account, you better be able to take care of the whole account. As an example, major high rise buildings have mostly carpet but stone lobbys, and kitchen areas and or some offices which are either vct wood and cork and mamolium. Each handled differently. As a side note, most of these types of buildings go for approx 6.5 cents a foot with one man carring a 35 to 40 thousand sq. ft. work load. The periodicals are usualy done by a septialty crew.