It has an oil well on it, so we plan to keep the mineral rights since there's no better ROI than ROI on something you don't have to put any money into - just hope the price of oil continues to climb. 

My impression is that housing price took a bit hit after oil price crushed a few years back. 

One of the advice I would give you if you do start thinking about investing here is don't buy properties that use oil to heat water or heat the property, it gets expensive quickly.

He was paying the heat out of pocket, oil radiant heat.

It's a lot like a mechanic....they can all change oil, and maybe they charge close to the same fee for it....but is someone going to try to sell you other things? 

@Travis BuckDude, if you got paid in bananas and coconuts, you'd still have to pay tax on that.

For example, I just put a 5 unit complex under contract that brings in $850 in rent per unit, my renter base is strong and reliable, I can count on the University, Military Base, and Oil works to bring home the bacon (Always willing to assign it).

If that furnace is oil or natural gas/propane it will most likely be in the rage of 60 - 70% efficient.  

The oil burst up onto the walls and ceiling leaving a residue covering a large area.

Since Allentown has a mixture of oil, gas and baseboards, the onus of heating is on the tenant.