According to the DOJ [1], no, however landlords were sharing non-publicly-accessible information about all of their units whether or not they were on the market

According to the DOJ [1], no, however landlords were sharing non-publicly-accessible information about all of their units whether or not they were on the market. Rent, discounts, rent term, lease status, and "the number of potential future renters who have visited a property or submitted a rental application." [1] https://www.justice.gov/opa/media/1364976/dl?inline https://www.justice.gov/opa/media/1364976/dl?inline