Mama bird chose to make a nest and lay eggs there at your present level of activity, since you don’t have a back door I would carry on as normal, opening and closing the door very gently, and completely ignore them if you can. House finches (nest and eggs look consistent with that) evolved to take advantage of human spaces, and that’s what she’s doing. Pretending they’re invisible will stress them out less than looking at them, and because of the MBTA you can’t really legally do anything else about it if they’re not a health hazard. If they hatch they’ll be out of your hair in about 2-3 weeks.