Determining investments. In determining the investments made to the nonconforming lot, structure or use, the ZBA may consider, in addition to any other factors which it deems relevant, the following: the purchase price of the nonconforming portion of the lot, structure or use; any capital investments or improvements made to the nonconforming portion of the lot, structure or use subsequent to purchase; the appreciation or depreciation of the nonconforming portion of the lot, structure or use subsequent to purchase; the cost to modify or terminate the nonconforming portion of the lot, structure or use, and any other costs or expenses which have been incurred by the property owner. There shall be an affirmative obligation on behalf of the property owner to provide any proof, documentation, or other sufficient verification of any alleged investments, improvements, and expenditures made into the subject property which would warrant an extension or alteration of the reasonable timeframe provided by the ZEO, and the ZBA shall have a right to request any proof, documentation, or other sufficient verification which it deems necessary in order to make a fully informed decision based on the specific facts and circumstances of the subject property. A failure to provide any such corroborating documentation may be held as an adverse inference against the property owner. See Table 1 of this section[1] for reference.