Number of acres? Square, rectangle, or landing strip?

Natural gas or propane?, Is natural gas available at street , front foot assessments?

City water available?,  City sewer?,  front foot assessments, hook up fees.

Well needed? Cost of digging , depth, quality, flow rate, reverse osmosis system needed?

Septic needed?, cost of install, perc test, soil composition, engineered percs are quite expensive.

Electricity available?, where is it?, cost of bringing it to property, hook up fees.

Road, public or private ?, or is it just an easement , is property landlocked?, paved road or gravel?

Is there a maintenance agreement in writing and recorded as to responsibility, costs, and requirements?

Survey?, Any easements or right of ways?, Is it a staked survey?, Wetlands or unbuildable areas?

Building envelope? Exactly where must the home be located? Setbacks on all sides?

Deed restrictions as to square footage of home, style, garage size, height? Is there an HOA?.

Are outbuildings allowed?, if so, what size, or what restrictions? Visit municipality office in person. 

Is the land splittable in the future?, check closely as to previous splits.

Is there a shared driveway?, Is it recorded?, maintenance agreement?

Cash, land contract or special financing loan to purchase?

Do you have a builder to work with and review plans prior to purchase?

Give yourself a lengthy due diligence time frame with an opt out clause while you are investigating.

Will seller furnish a signed vacant land disclosure form?

Finally, it never hurts to meet some neighbors prior to purchase. 

If you had a 90%+ furnace installed in the last few years, please read. 

The addition of a secondary heat exchanger to extract heat from the exhaust is what makes the efficiency difference between the older conventional furnace and the 90%+ units. Since this exhaust is much cooler than the conventional furnace, condensation occurs quickly, and a drainage system of plastic plumbing is used, this system can get clogged or leaks and the water backs up into the inside of the furnace and rusts it from the inside out. The homeowner will not even know this is happening.

At issue here is that the secondary heat exchanger is made out of polypropylene laminated steel. With heat and age , this laminate cracks and allows water intrusion that rusts out the heat exchanger, which will eventually allow deadly carbon monoxide to enter the home.If you notice any water under your furnace  ( and it is not from a neglected humidifier ) you need to call an authorized repair person to look inside your furnace to determine if the drain lines are clogged and the heat exchanger is rusting.

There was a class action lawsuit and settlement made in November 2007 , that included Carrier Corporation which manufactures Carrier, Bryant, Payne and Day and Night brands. Carrier Corporation will cover, for 20 years after initial installation, all parts and labor required to replace the condensing heat exchanger and associated parts in the event of a mechanical failure. (water on the floor and a heat exchanger with rust holes ).

This water condensation problem can be an issue with nearly all 90%+ furnaces. It would be wise to have a safety check performed on the condition of the heat exchanger so you do not become a victim of carbon monoxide poisoning.