Good deal. 50m per acre is 25m per half acre which is the going rate for such areas. It would be best to develop a gated community, much like Kihingo village, Rosslyn Heights, and sell the units. 8 acres would hold 16 units each on half acre. Assuming each unit is about 400m2, construction cost would be about 15m, adding the land cost at 25m gives a total cost of 40m for each unit. Each house should sell at 50m to give a 10m profit, or 160m for the whole 16 unit project.