There are three closings of two flats over the past three months in Forest Park. The range is between 162k and 309k. Another is pending and was listed at 389k. Your in a great area near circle and Madison, but it's tough to say what it should be priced at without seeing the property. By the bedroom count you've listed, sounds very unique. There are a total of 31 on the market, one with a similar bedroom size at 300 Marengo, priced at 275K.
Feel free to contact me with more questions or for a CMA.
Best of Luck