NEWMARKET'S Holland House stables were set on fire by arsonists on Saturday night.
Fire crews from Newmarket arrived at the two-storey derelict building in Rowley Drive at around 11pm.
They left the site just before 3am but one fire crew returned to assess the damage on Sunday.
Holland House, formerly known as Lansdowne House, was owned by Jack Watts in 1920.
It was bought by Basil Foster in 1957 and renamed in honour of chaser Joe Holland, who gave Foster his first success after he started training at Enfield in 1955.
The site was thought to have been occupied by squatters and has been vacant for several years.
Anyone with information should contact Pc Neil Van-Holland at Newmarket Police on 01284 774100 or Crimestoppers on 0800 555111.