This study is based on a field survey and historical data of Tehran's great Bazar. As a result of survey, we found existing 32 commercial facilities which are shown one or both maps made in 1857 and 1891.And based on the number of courtyard and passage (dalan), 32 facilities could be classified into 4 types.
1. type-a with single dalan and single courtyard.
2. type-b with single dalan and multi courtyards.
3. type-c with multi dalans and courtyards.
4. type-d with no courtyard.
These 4types of commercial facilities extended from east to west of Bazar. And as it goes west their formation become subdivided.
