Chapter XI: Section 16: If such owner or some person on his behalf shall within

two weeks from the mailing of such notice notify in writing the Commonwealth or the city that such owner wishes for an appraisal of such parcel, the Commonwealth or the city shall cause such parcel to be appraised by three competent and disinterested persons, one of whom shall be appointed by the Commonwealth or the city, one by said owner, and one by the superior court for the county: _Provided, however_, that the Commonwealth or the city and said owner may in writing appoint a sole appraiser. Said appraiser or appraisers shall forthwith after his or their appointment view the property and determine the fair value of such parcel, and shall make written report to the Commonwealth or the city of the same. The reasonable fees and expenses of the appraiser or appraisers shall be paid by the Commonwealth or the city. The Commonwealth or the city shall forthwith by writing mailed to such owner offer such parcel to such owner at the value as determined by the report of a majority of such appraisers, or by that of the sole appraiser in case of the appointment of one appraiser.

Section 17. If such owner shall in writing accept said offer within two weeks after the date when the same is mailed to such owner, the Commonwealth or the city shall convey such parcel to such owner on payment of the purchase money to the Commonwealth or the city, as the case may be, within thirty days after the acceptance of the offer. The conveyance shall be by deed, with or without covenants of title and warranty, executed and acknowledged in the name and behalf of the Commonwealth or the city by the officers or board which have or has taken such parcel, or by their or its successors or successor, and may be made subject to such restrictions as the Commonwealth or city may in writing have notified the appraisers or appraiser at the time of their or his appointment would be imposed on such parcel.

Section 18. If such owner fails to accept the offer within the time limited, or having accepted it fails to make payment or tender of the purchase money within one month thereafter, the Commonwealth or the city, if it does not take said adjoining property under the provisions of section twenty-nine[88] may at any time thereafter sell such parcel at public auction.