When looking over the Faculty of Science from the Science Library, my former classmates from 30 years ago looked over the faculty against their mental images and remarked, “It’s become so crowded”.
Our BSc class year graduated in 1990 and One Historical Map has street maps from 2017, 2007, 1995, 1984, 1975 and 1966. The webpage allows a side by side comparison and I picked the 2017 and 1995 maps. Yes, it has become crowded indeed.
Street map comparison of Faculty of Science in 2017 (top) and 1995 (below); screenshot from One Historical Map
In addition to building density, student numbers have increased too, especially amongst grad students. There were 4,977 students (4,594 u’grads + 383 grads) in 1994/5 and this had increased to 6,675 students by 2016/17 (5,126 u’grads + 1,549 grad students).
Oh well, during this time, the population density in Singapore increased from 4,814/sq. km to 7,796/sq. km. These are different times indeed.
Otterman speaks... 
Really fascinating to see. Going back further in time to the 1950s maps – how “empty” the interior of Singapore used to be!