Some landlords will bulk at replacing a window pane just because of a tiny crack in the corner or repainting a peeling window sill.  

All of our properties have either double panes or double windows for energy efficiency and each room has at least one window/door which functions well for egress.

First I would go buy a GMC Z71 4x4 PU truck SLT crew cab 20" wheels and all the extra goodies 50k cha ching so now we are down to 130k so next I buy my wife those new triple pane windows for the crib she has been wanting 22k cha ching now down to 108k so next I buy a master bath remodel 18k cha ching so now down to 90k so next I buy those new plantation blinds (must have for new windows) 3k cha ching so now down to 87k  so next my wife has to have a new car 37k cha ching so now down to 50k so next I use 20k cha ching to pay off credit cards and misc debt so now down to 30k so next the kitchen has to be remodeled 35k cha ching OOPS now I am 5k in the hole YIKES.

Double pane windows offer reduced outside noise pollution, and are energy-efficient.

I replaced two broken window panes in a rental yesterday.I would have GLADLY paid $60 to not do it.

When trying to replace one of these, I broke a window and had to buy a new dual-pane unit.The screens protect at least some of the windows from this hail damage, which is not practical to repair.

In a 2nd story apartment building that is as old as yours, there probably isn't good insulation, or double pane windows.

Other units are updated with the energy efficient windows, and we have those thin single-paned alumimum windows.  

@Robert F strain, Thanks for your reply.  

@David Tsedaka old windows will definitely be an issue if they're single pane or drafty.