Servcice tax query

Hi

Mine is a Construction  company, we have office  in bangalore, we are doing Interior work ( work contract service ) .

What all input service tax we can take in this condition.

Like telephone we are using for project work, can we take input credit

        In office rent can we take any portion of rent as input credit

          In office electricty bill can we take input credit

  Pls guide me

Regards

Muralidhar.K