On the 1890 map
Bryn Menai, Holyhead Road, LL57 2JA
Today part of WEA Cymru - formerly Coleg Harlech WEA
Before that the
North Wales base for the National Rivers Authority (for at least between 1990-1996)
The National Rivers Authority (NRA) was one of the forerunners of the Environment Agency of England and Wales, existing between 1989 and 1996.[1][2] Before 1989 the regulation of the aquatic environment had largely been carried out by the ten Regional Water Authorities (RWAs).
Earlier it was a Preliminary Training School for the C&A (p62 Portrait of the C&A - Beer)