My wife and I who live out of state are buying a small apartment of about $600k in LA, CA, and allow my adult daughter to live there without paying rent. Is there any federal/state gift tax here to pay? If there is, is that based on fare market rental value or something else, and may we still use exclusion amounts ($15k x 2 in 2020) for that tax (if there is)? No annual form 709 filing?