A. Any state institution may acquire by condemnation title to (i) land, (ii) any easement thereover or (iii) any sand, earth, gravel, water or other necessary material for the purpose of opening, constructing, repairing or maintaining a road or for any other authorized public undertaking; however, such acquisition by condemnation shall only be commenced if the terms of purchase cannot be agreed upon or the owner (a) is unknown, (b) cannot with reasonable diligence be found within this Commonwealth or (c) cannot negotiate an agreement or convey legal title to the property because the owner is a person under a disability.