Not sure why you are not able to reflect residential real estate, but the correct life is 27.5; so don't use the current default. Try and go back through the interview process to see if something was either missed or accidentally answered incorrectly.
MACRS conventions are terminology for when depreciation starts; there is half year convention and mid-quarter convention for personal property and then mid-month convention for real property.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
