Service tax on immovable property

hello ,

i have a query and quite a urgent one actually ..any help would be greatly appreciated.

i had one warehouse which i had rented out to a corporte which fetched me a rental of Rs.6 lakhs per annum.

since my rental income didnt cross Rs.10 lakhs  i didnt charge any service tax from my client.

now i have built another warehouse which i have rented out to another corporate ( not the earlier one)

which would fetch me Rs.8 lakhs per annum as rent from next month.

i have a doubt.. since both my rental s incomes whn added up exceed 10 lakhs should i charge service tax on both my clients or do i still be exemt from service tax since my each rental has not crossed 10 lakh limit.

can any body guide me through this..would be a great help.

thanks

sundeep