Hi Janie, To do a market value of this property you would need to provide a great deal of information.
sq. footage, rental income, loss, taxes,insurance cost,type of comm.space,area comp. and so much more.
There is no easy answer if you want an accurate opinion.
This also involves a great deal of time research for any Agent to do.
Our advice is to contact an Realtor who is experienced with commercial real estate to give you an expert comp on your property.
All the Best
Dave & Lisa