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They may be able to prevent you from installing the windows if they look very different from the others and affect the overall apperance of your complex as a whole.
However, there is a simple solution, which is you can get removable grids for the windows, so go ahead and install yours and get the removable grids (they are made to come off so that you can easily clean the windows and snap on and off the windows) and then nobody can object that your windows do not match.
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