I am rehabbing a house that has a buried oil tank in the backyard. 

Who really is my think tank.

For example, houses at one point were allowed to have underground buried heating oil tanks.

How much to you think the market could tank during your rehab holding period.The risk of declining values is that you will get a lower appraisal at the time of your refinance. 

I do have a copy of the septic inspection,,its not the tank, its the leach field.

When I do get an exclusive duplex available, my buyers are sharks and take them immediately.

P.S. just a warning that I will be empting out my tank full of dumb questions so I hope I don't upset anyone.

HW Tank, AC, etc.) while you would be responsible for structural (e.g. roof ), insurance and property taxes.

Moreover, Brokers and salespersons similarly have no special training, knowledge or experience with regard to evaluation of possible environmental conditions which might affect the Property pertaining to the dwelling, such as the existence of radon gas, formaldehyde gas, airborne asbestos libers, toxic chemicals, underground storage tanks, lead, mold or other pollutants in the soil, air, or water."

After 9/11, the NYC economy tanked.