Even under the general heading of "office" there are many types of office buildings.  Generally they are broken up by size and class.  Here is a breakdown of the differences:

1.  Low-rise-  Above ground level, fewer than 7 stories

2.  Mid-rise-  Above ground level, between 7 and 25 stories

3.  High-rise-  Above ground level, more than 25 stories

• Class A - High quality finish, modern design, accessible, highest rents
• Class B - Lesser quality finish, may be somewhat outdated, typically older buildings
• Class C - Fair finish but with much lower rents, may have some functional obsolescence