Office environment dataset collected at UIUC by the Ponce Research group. This dataset is property of the Ponce Research group, you should ask Jean Ponce (ponce at cs dot uiuc dot edu) before use.
The link to their webpage is here ('object Recognition Database). I have a copy of the dataset here. However my copy will NOT be updated. You should use the link to the page on the Ponce group website and use their official distribution.