(No, I did not say Abe Lincoln)
There are several factors here. Firstly is that you and your service animal are protected, but for whatever reason, common sense is becoming less and less... common, so people fail to realize that people with disabilities might need some extra room to get around. It should be common sense to not approach a service dog to pet or to allow their pet to attempt to play with them. People are forgetting to apply common sense, and it is as simple as that.
You have contacted your complex about your concerns of safety. Document that and hold on to it. Your next step is to contact the police department to file an information report. You're not pressing charges, you're not dooming anyone to a stay at the jail, but what you are doing is showing that you are legitimately concerned for your safety and documenting that you've sought solutions/options. The next step is to contact code enforcement (which the police will likely have you do) and code enforcement can come out and see if the complex is violating any city code on the matter. They can also inform you on ways to request a city ordinance/code be implemented to help protect you.
Code Enforcement might be able to mandate notices & signs as well, in addition to requiring the complex to send out notices to all renters, and perhaps include a 'People with disabilities' information guide with their new resident application package. The onus is on the business to protect its customers/residents.
Lastly, contact the corporate office of the community you live within. They're the ones with the actual authority to change the way their subsidiaries handle new resident applications, can force them to add disability information onto these applications, and can approve for signage and the like to be put up around your building. Corporates worry about liability. Liability is the ONLY thing corporations care about more than profit, bc liabilities eat away at nothing but profit, and liability cases only cause for their liability insurance to skyrocket.
When contacting corporate, inform them that you are in the process of contacting the police department and code enforcement to come out and take a report, as well as to look into the matter to see if the complex has violated any laws. Don't say that you've already done it, say that you're going to. This will ensure that they respond to you immediately. They do not want law enforcement and code enforcement called out, because generating a call for service with your/their address shows up on Compstats, and it can deter future residents from looking into residing there "Man, the police gets called out there a lot, better look elsewhere."
You have the responsibility to protect yourself, and guess what... so does corporate and they know this. Contact them, voice your concerns, detail what you've done so far, as far as going to the complex office is concerned. Do not tell them that you've already contacted the police and code enforcement, only inform them that you are going to, because this will ensure a rapid response from them.
Okay, maybe I did say Abe Lincoln.