It's easy to know if they're legitimate.... if they require an up front fee more than an application fee (couple hundred dollars, tops), and possibly an appraisal ($300-$600), walk away.

“You have to respond to leads, even legitimate leads, within minutes or someone else scoops it.A Zillow Group spokesperson also confirmed that the ads are fake and told Inman the company is working to monitor scammers who use their logo or domain to mislead the real estate community.

  :)  Tax-ignorant clowns like Grant Cardone (who amazingly holds an accounting degree) love to "teach" bogus "tax-saving loopholes" - like put a business sticker on your car to make it deductible.You car is only deductible if it is actually used for a legitimate business, as @Lance Lvovsky explained. 

The duration of the lease, if a lease (Assuming it's a legitimate lease).

If something legitimately breaks, we'll take care of it, but this is one of those "Help, a lightbulb burned out!"

Are the PM charges legitimate needs?

There are legitimate reasons someone may have stopped in the middle to sell, but there are hidden reasons as well.

If they have a legitimate lease, you must honor the lease unless you are intending to occupy the property yourself.

It is much easier to find money when you have a legitimate deal. 

They can add legitimate expenses related to finding a tenant to your costs.