It depends, AJ, on what your pay rate is currently and your length of time with the company. Obviously, hind sight is always 20/20, so, in order to protect yourself, ask yourself what is in YOUR best interest. First, retention bonuses are offered by the owner when the owner understands your value to making the sale happen. In 100% of the property sales I have been involved, I was the only one showing the property(s) and presenting the asset. Usually this is because the manager will understand the position of the property and can present it in the most favorable manner. Managers are very valuable. The Retention Bonus is to motivate the onsite team/person to keep occupancy and operations optimal (in other words, don't neglect your duties while you hunt for another job all day long.) The time to get this nailed down is usually as soon as the Owner tells you the property is being put up for sale, but can happen a little later in the process. Some people ask for a percentage of their salary, but certainly, remember, most Owners actually have investors to pay off, debt, and bills to pay so some will not offer what you may think you are worth.
However, in addition to what Kristi suggested, please ask yourself if you want to stay with the property after the sale. New Owners often feel relieved to know they do not have to look for a new manager after they assume ownership. If you want to stay, remember to present yourself as an asset to those looking to buy the community. In that way, you can relax during the uncertainty that a sale can present.