Many jurisdictions allow contiguous property owners to file a protest petition and stop you dead in your tracks unless you negotiate a deal.

Track all of your income and expenses on all projects that you are responsible for in a report for that you can review regularly with some people you trust and know and understand your goals.  

Remember a service animal falls under the ADA with the Dept of Justice. 

The two largest brokerages in the metro area have a policy not allowing their agents to act as dual agents even in the jurisdictions where it is legal to do so.

Track all of your income and expenses on all of your properties that you are responsible for in report-form and review them regularly with a few people that you you can trust and be knowledgable.  

Go to some REIAs, network, shake hands, have a plan to show them, and more importantly a track record that shows them you won't lose their money. 

Being that I don't hire a lot of work out, I keep track on a spreadsheet.

Another way is to buy property with non-agency loans and then refi into agency down the road once you have established a track record in that market.

You are right , so it is better to purchase one 6 unit building  but looking at the cash flow  for 6 units  at Burbank, ROI of $345 per month from 6 apt it is not much  , very little  cash flow. on the other hand   6 flat in Justice  cash flow is  -$352 so I think the price is too  high, am I  correct?

It sounds like the potential tenant is lying and now trying to cover up their tracks.