Take photos. Try to visit a site during the worst time for a location, like monsoons so you know what is the worst to expect
Construction Quality: Check the ceiling and walls for cracks or moisture
Interior Quality: Check quality of fittings such as flooring, cabinets
Foundation: Cracks on the outer walls point to poor construction
Official Inspection: Try to get the results of the last building inspection
Structural Engineer: Hire one to assess the structural integrity of the building
Lifts: Get a sense of how long you will wait for a lift during busy times
Power: Ensure there’s emergency power backup for outage
Water Supply: Is the water supply 24/7?
Wiring: Turn on each switch to see whether everything works
Phone signal: Check whether your signal is clear in all zones
Plumbing: Flush the toilets and run the taps to see pressure and plumbing quality
Leaks: Check for leaks from the walls, ceilings, under sinks, and on pipes
Flood risk: Assess possibility of damage due to moisture. How badly is transit affected?
Safety: Does the building have a guard or cameras? Have there been any break ins?
Timing: See how light, noise etc. may vary throughout the day