Sale price for 3 bhk flat near vyttila

I'm looking to sell my 3BHK flat near Vyttila. It's in a 5-story apartment building and is quite spacious. The building is about 10-12 years old but in good condition as we've recently done renovations and painting. The flat is located on a road parallel to the Vyttila Bypass close to TocH School. Since I'm an NRI I have no idea what price I should ask for the property. Many of my neighbors downplay the value because they have interested parties (friends/family) looking to buy their flats. Can someone give me a ballpark figure for how much this might be worth.