Place of business diff.from the place where they originated.

Hi 

One of client doing electronic goods trading and cable laying work at Coimbatore.

It is a partnership firm their place of business at coimbatore is  mentioned in the deed.

Now they they expanding their business in chennai, they taken a unit run the business in chennai for that they have made a rental agreement. Upto Now they did not take service tax registration since they are in the scheme of SSP(Small Service Provider) Now they want to take Service Tax Registration.

1.Can they go for Chennai address with Rental agreement ? or should the get only with the address in partnership deed?

2.Firm is unregistered and one year old.