About South Lake Upper Marlboro, MD South Lake is a +/- 281-acre mixed-use development in Bowie, MD. For the residential element, 325 multi-family apartments units, 128 two-family attached condos, 563 townhouse units, and 344 single-family homes.The commercial side, which is will be +/- 65 acres, will include shopping, restaurants, hotels, and entertainment. Finally, the development also has ample outdoor space with a large lake, a clubhouse, and walking trails.