Service tax registration issue- problem

i m having a problem with service tax registration

issue is that - my friends'wife running a business as sole proprietorship
                       she require Service tax registration
                       offilce place is on the name of her father in law ( ie. My friend father) he is no more

now what are the documents require for the service tax registration for which registration is to be sought out in that situation

According to guidelines- documents required

3) Documents Required for the premises for which registration is sought;
     Proof of Address: Any one of the following:

a. In case of self-owned property, any document like Annual Property tax payment return/receipt             showing name of applicant, or copy of sale deed etc. may be provided.

Or

b. In case of a rented premises, Lease License/rent agreement or rent receipt of Registered Co. Op.          Housing Society.

Or

c. In any other case, NOC (No objection certificate) from either the owner of property or the person       in whose name the rent or lease agreement has been made along with evidence of                                 ownership/tenancy as the case may be



but in that case- what is required ...

plz provide appropriate answer