To accurately check whether specific properties are within 100 metres of a landmark (for example, an MRT station, mall, or a particular block), you can use EdgeProp Singapore’s map-based tools such as LandLens, where you can set a very small radius and visually verify which condos or HDB blocks fall within that distance.
Thank you for your query with EdgeProp Buddy. It's always wise to seek counsel from a real estate professional for these types of matters.