Its in the 2011 Budget for the PMO. I guess he was not happy with his office layout? Maybe he has to walk too many steps to take a shit? Who knows, but $3.5 million is way too much.
http://www.singaporebudget.gov.sg/budget_2011/revenue_expenditure/attachment/27 PMO EE2011.pdf
http://www.singaporebudget.gov.sg/budget_2011/revenue_expenditure/attachment/27 PMO EE2011.pdf