(a) Owners and managers of multifamily housing projects having accessible units shall adopt suitable means to assure that information regarding the availability of accessible units reaches eligible individuals with handicaps, and shall take reasonable nondiscriminatory steps to maximize the utilization of such units by eligible individuals whose disability requires the accessibility features of the particular unit. To this end, when an accessible unit becomes vacant, the owner or manager before offering such units to a non-handicapped applicant shall offer such unit: