The lease was granted in 1954, so unless the Grosvenor Estate team included some particularly gifted clairvoyants it's unlikely the lease made any provision for the conversion into a hotel in 2017. A licence for alterations might impose those conditions, but equally those conditions could be imposed by a consent to works granted under a restrictive covenant. Without knowing the terms of the lease, it's all speculation.
The lease was granted in 1954, so unless the Grosvenor Estate team included some particularly gifted clairvoyants it's unlikely the lease made any provision for the conversion into a hotel in 2017. A licence for alterations might impose those conditions, but equally those conditions could be imposed by a consent to works granted under a restrictive covenant. Without knowing the terms of the lease, it's all speculation.