Much depends on whether the property is a corner or an interior property and how many stories it is. I would suggest consulting with Dan Kingkiner of Kingkiner Brothers (215-783-1153). Dependable, punctual and professional, Kingkiner's demo prices are fair. Based on working with him in the past, a 3 story corner would be in the realm of $35,000, while a 3 story interior would be around $25,000.
By the way, don't discount insurance/licenses. Demolition of a building is somewhat involved, and the last thing you need is a problem created by a contractor who is not fully insured or is employing individuals who are uninsured.