I recently lost a prospective client simply because I asked that our first meeting be at my office, rather than at a vacant property at 9:15 at night.
I would have loved to help him, but frankly, no paycheck is worth my life.
And no real estate deal should be worth yours.
It may seem inconvenient to meet a Realtor at his or her office before looking at a duplex you want to buy. But it will go a long way toward establishing a long term, successful and happy working relationship for both of you.