(A) If the acquisition of only part of a property would leave its owner with an uneconomic remnant, the condemnor may acquire the remnant concurrently by purchase or condemnation.
(B) "Uneconomic remnant", as used in this section, means a remainder following a partial taking of property, of that size, shape, or condition as to be of little value or that gives rise to a substantial risk that the condemnor may be required to pay in compensation for the part taken an amount substantially equivalent to the amount that would be required to be paid if it and the remainder were taken as a whole.