I've walked past here a number of times over the years, but only recently made the effort to actually stop and read the information on the sign outside. The building view from the street and the sign are all you'll probably be able to access though as it doesn't seem to be open to the general public.

Alsaagoff Arab School, or Madrasah Alsagoff Al-Arabiah to give it its correct name, was established in 1912 and is the oldest surviving madrasah in Singapore. The school traces its origins to the 19th Century when Syed Mohamed bin Ahmed Alsagoff started a small local school in the Malay Quarter of Singapore to teach the fundamentals of Islam to Muslim boys. To ensure its continuity after his death he left an endowment for the establishment of the current school. As a matter of interest, the school started accepting girls in the 1940s. As the number of girls enrolling soon outnumbered the boys, it was turned into a girls school. Today, in accordance with modern practice, students are also taught maths, science, Malay language, Islamic studies, Arabic and English, the levels of which must comply with Singaporean educational standards.