In the Maps Editor, the building marker gets placed in the center of a building by default. However, in practice, you would like to guide visitors to the nearest main entrance.
To provide more accurate directions move the marker to the primary entrance of the building to ensure your visitors get better and more accurate directions from point A to point B.
Here's how:
In the left navigation go to Map > Editor
Navigate to your building that you want to add a point for
Click Edit
Under Map Feature click Point, then place your point on the map where the main entrance is
Publish & check accuracy in your Directions Tab, you might need to make adjustments