May I collect severance pay if I find new employment prior to my involuntary termination date?

I have been notified that my office will close in six months, terminating my position. By company policy, I am thereby eligible for severance pay. I am not required to stay through the closing date if I find other employment before then. (edited to add: I do not have an employment contract that spells out severance terms; severance is addressed in the employment policy handbook, and is granted for involuntary termination only. Having been advised of an impending involuntary termination, does leaving for another job then make my termination "voluntary", disqualifying me for severance pay? If my job were not being eliminated, I wouldn't be looking for another one.