They hold regular tours which I tried to apply but was unsuccessful due to it being cancelled.
Quoted from the LSC website:
"Lui Seng Chun is an old Chinese shop house (tong lau) originally owned by Mr. Lui Leung, a renowned businessman who moved to Hong Kong from Taishan county in Guangdong province. Designed and built by architect W.H. Bourne, the building was completed in 1931 with a total gross floor area of 600 square metres. Typical of all tong laus at the time, the ground floor of the four-storey building was used as shops while the upper floors were used as dwellings.
Since the 1960s, the Lui family began to move out of the building as the family continued to grow in size. The building became vacant in the 1970s. In 2000, the Antiquities Advisory Board designated Lui Seng Chun a Grade I historic building. With the vision of preserving the building and to contribute to society, the Lui family decided to donate the building to the Government in the same year.
The Lui Seng Chun building was included in Batch I of the "Revitalising Historic Buildings Through Partnership Scheme" initiated by the Government in 2008 and, after a bidding process, Hong Kong Baptist University was selected to conserve the building and convert it into a Chinese medicine healthcare centre. The revitalisation work was completed in early 2012 and the clinic, Hong Kong Baptist University School of Chinese Medicine – Lui Seng Chun, commenced operations in April 2012."
Anyway, they serve herbal teas on the ground floor so decided to get the tea for fun which was unsweetened but not too bitter.
There were four different teas so it depends on how you feel but the lady there should be experienced enough to identify your symptoms and serve you the appropriate tea.
For more information and tour applications:
Lui Seng Chun (雷生春)
Grade I Historic Building,
119 Lai Chi Kok Road, in Mong Kok, Hong Kong.