Bathing in sea water was believed to be very good for your health in the 19^th century. This could and did take place in the sea. But for rich people seeking to improve their health this was not enough. The weather could make this unpleasant in the summer and it would be impossible in the winter. So establishments such as Granville Mansions were built to allow the wealthy to be immersed in water at all seasons and under suitable medical supervision.

Are there any clues in this picture that Granville Mansions was doing rather well?