Deduction of Interest in case of Vacant House Property

One of My client is engaged in the business of constructing and letting out business parks and complexes.During the FY 09-10,it obtained Building Completion Certificate for one of its Business Park in May but the same remain vacant till the end of the year and no rent income is earned.Whether loss from house property can be booked to the extent of interest paid on the loan since there is no income.