(i) the tenant's initial tenancy commenced after the owner acquired the property, and the owner requires the housing accommodation in connection with its charitable or educational purposes, including but not limited to housing for affiliated persons; provided that the owner may not refuse to renew the lease of a tenant whose right to occupancy commenced prior to July 1, 1978 pursuant to a written lease or written rental agreement, and who did not receive notice at the time of the execution of the lease that the tenancy was subject to nonrenewal; provided further that a tenant who was affiliated with the owning institution at the commencement of his or her tenancy and whose affiliation terminates during such tenancy shall not have the right to a renewal lease; or
(ii) the owner requires the housing accommodation for a nonresidential use in connec tion with its charitable or educational purposes.
(2) In addition to such penalty provided in section 2526.2 of this Title, the failure of the owner without good cause to utilize or to continue to use the housing accommodation for the purpose intended after the tenant vacates, and for four years thereafter, shall result in a forfeiture of the right to any increases in the legal regulated rent for the housing accommodation involved for a four-year period following the recovery of the housing accommodation from the tenant.