Native Cross Timbers species such as the Post oak and Blackjack oak have been on a decline due to rapid urban development. Post oak and Blackjack oaks are a slow-growing species, thus many of the large calipers sized trees living today, are between 100-300 years old. They have provided many ecosystem services to the region in the past, therefore the loss of these trees affects the region significantly. A city that is experiencing rapid development in the Cross Timbers is Flower Mound, Texas. Flower Mound has experienced rapid growth within the last 10 years and was named the 11th fastest growing city in 2016 and its population has grown by 50% since 2000. Growth has converted agricultural, open space and undeveloped land to residential, business, and urban centers. Flower Mound has a policy that requires developers to plant trees, to make up for the loss of trees post-development. In this study, the focus will be on the type of tree species that are being planted, the extent of biodiversity, and the condition of the trees in two residential developments. This analysis will explain if the new trees will one day live up to the previous ecosystem services.