Premiums upon which contributions are required shall, in general, be allocated to New York on the basis of the location of the risk and conform to the allocation of premiums in Schedule T of the Annual Statement. Premiums on ocean marine business shall be allocated on the basis of the location where the policy is negotiated or placed or, in the case of builders risk coverage, on the basis of location of risk. Inland marine premiums shall be allocated, when possible, on the basis of the location of the risk. If, however, the property insured has no permanent situs, the premiums on such risks shall be allocated on the basis of the address of the insured appearing in the policy. In the case of extended exposure, inland marine premiums shall be allocated to the place of principal exposure.