The oldest buildings in Siglap r not the commercial buildings but the residential houses.
Actually at corner of Changi Rd and Frankel Ave (opposite the old Dawoods Prata Shop), there was an old building that used to house a church on 2nd floor and Building materials shop on ground floor. On the top left corner of 2nd floor, you can faintly see "VS Market (1937)". This must have been quite a landmark in the old old days as whole area was probably just a giant kampong. Sadly, as I write, this nondescript building is being demolished to make way for more private housing.
Any old timers from the area can shed some history on this VS Market?