the images , captured between 1850 and 1855 by photographer hugh owen , have surfaced after being put up for auction - and could fetch up to £ 30,000 .
it became part of the site for the bristol brewery georges before that was closed in 1999 and later turned into a block of flats .
many of the buildings pictured have changed dramatically between the 19th century and today , particularly the area of high street .