Can't really tell you specifics but the offset area on the sides of a building are adjusted according to height. For example, a twenty story building has to be farther away from the street and boundaries than say -a five story building. This is for older areas - newer planned residential communities (luxury ones) more often have bigger offsets and have designated walking trails, sidewalks.
Height around five mile radius of airports is limited to about 160 feet I think. Closer than one mile it is even less (~50 feet).
Hatirjheel shots - the second one shows the U-Loop. Two U-Loops are being built for the Hatirjheel project: one at the Rampura/Banasree area (work started in early 2015) and one at Hatirjheel near Badda. The Rampura loop has been pictured second last. They will be used exclusively for cars that want to either exit or enter Hatirjheel from either Badda or Rampura while avoiding traffic on Pragati Sarani below.