Double Hung Windows + Casement Windows

[sefnfot]

Does the code require double hung or even single hung windows to work like new and stay open? Or can I just require the tenants to use a brace for this?
This is for a 100 yr old building ( apartments ) . some windows don't stay open,
and on this there is a difference between slamming shut or just sliding down.

Also I remember reading that •Casement Windows are not required to work like new windows.

I have aluminum crank windows that the levers always break down and the locks never seem to reach the mechanism ; my opinion is that there are 2 locking features: one is the crank and second is the manual lock.
This is the type of lock that is used :

[Jerry Peck - Codeman]