Renting Out a Vacant Backlot

[Diane Tycangco]

Hi everyone!  I have a rental property whose lot is rectangular and very long.  The street facing part has a house and a detached garage.  There is a back garden and behind that, is a fenced area of 1/4 acre.  I was wondering if I could rent out the empty back lot.  The tenant would have to go through the main house backyard to get to his rented lot.   There is no other entrance to the empty lot.   Is this possible/legal?

How much rent can I charge for 1/4 acre?

Thanks.