Selling a house in Brussels within 5 years

Hi, we have a house in Brussels which would like to sell after 4 years as we move back to Canada. I gather that we will be taxed on the profit but at the same time, might be able to get back some of the money we paid in taxes. Does anyone have any specific info on this- i.e. how much will our profits be taxed at (18%/ 33%?) and will we get any back from the taxes we originally paid? Also, would it work out better to keep the house for renting and sell it after 5 years (but I guess it won't then be a primary residence). Any answers welcome and thanks!