A few rules to live by,make sure you are pre-qualifying,most prospects will take the tour even if it doesn't meet there needs so we need to treat them like eny other person(s) that inquires about the property. In this case it's not the lack of poor closing skills.
Take the time to get to know your prospects and this is where your going to make your impression, your greeting is key, someone will make their impression of you in the first 5 seconds of meeting you so let that personally shine. Keep in mind you are selling your self, the management company and property thought the visit. So you have wined and dind pulled out all your tricks, still no deposit, ask them straight so what is stopping you from leaving a deposit today that is an open ended question and you just might get a straight answer.
Remember buying is a feeling, so take a look at your leasing office to make sure its inviting right down to the smell, if you can have music play it.