Urstadt Biddle Properties' shareholders are likely to benefit from the all-stock acquisition by Regency Centers, as they will receive shares in the larger, more diversified company. This could lead to a short-term increase in Urstadt Biddle Properties' stock price.

The acquisition of Urstadt Biddle Properties by Regency Centers is a significant event for both companies. However, the short-term impact on Regency Centers' stock price is uncertain, as the market may react positively to the expansion or negatively to the cost of the acquisition.