All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
There is no harm in purchasing land and selling it with a profit, this is a permissible sale. This is included in the Saying of Allaah (which means): {Allaah has permitted trading and forbidden Ribaa (usury or interest).}[Quran 2:275]. It should be noted that you should pay Zakat on this land if it reaches the minimum amount liable for Zakat and a whole lunar year elapses on the capital money with which this land is purchased.
Allaah Knows best.