Some more thoughts about marketing, my suggestions are centered around low or no cost venues for many reasons:
1) There is some logic to Matt's suggestion; a long time friend of ours has a motorcycle accessory business and his primary website comes up at the top of the search results when you type 'gold wing accessories'; but he pays extra for that, for him this is a wise use of his money as his business has grown significantly since he founded it. The problem lies in the fact that many properties may not have the funds in the budget to spend extra for marketing in this way; particularly if you are an affordable property, a property that is in financial distress; or worse in receivership.
2) The OP did not mention if the property was a conventional or an affordable property; if it is affordable, there may be specific requirements within the affordable program that specify how you must market.
3) If the property is affordable with a target demographic; reach out to your community to find social service agencies that serve that demographic. You can reach out to interfaith groups for referrals as well; these are often operated by members of houses of worship representing all faiths who may have members looking for housing.
4) Your RESIDENTS are often your best representatives; offer a generous referral bonus, but make sure you stipulate that in order to receive a referral bonus, the new household must be residents for 90 days, and BOTH residents must be in good standing (no delinquent monies) at the 90 day mark before a referral bonus is submitted for payment.
5) If you offer a resident referral and you get a referral from a house of worship through outreach marketing; you could make a donation to their discretionary fund on the resident's behalf. If the referral comes from a service organization; that donation can go to their operating funds as well.
6) If you get a military resident; make a donation to a local VFW (or other local veteran's organization), to the Wounded Warrior project (or the DAV) on the new resident's behalf.
7) If you get a referral from another property and offer a referral bonus to them, find out if that violates their company policy before making that offer. Some companies take that very seriously. If you have a network of properties within your company that are nearby, I would limit the referrals to those properties.
One of the things I did for a property I was at that was pet friendly in an area where there were no others that were; was make contact with a local animal hospital to develop a cross marketing agreement with them: I created a flyer written from the perspective of the pet that let their human live with them, this flyer was posted in their waiting rooms, inserted in their billing, and posted on their website/facebook page. In exchange, the animal hospital was allowed exclusive permission to market to residents in many of the same manners. Since this property also had service animals and service animals in training, special discounts and free services were included for them as well.
Many of the methods I mentioned were used at a property that was as low as 75% occupied while I was there (I had the need to welcome a number of residents to leave for various reasons, resulting in a spike in vacancy), resulting in a 98% occupancy the week I left with 2 working applicants at an affordable property (one of these applicants I needed to decline). I was there almost 18 months.