Such alteration, reconstruction, extension or enlargement shall be permitted only by special exception as may be approved by the Zoning Hearing Board pursuant to this Chapter.

Such alteration, reconstruction, extension or enlargement shall only be upon the same lot as in existence at the date the use became nonconforming.

Any increase in volume or area of the nonconforming use or structure shall not exceed an aggregate of more than 1/3 of said volume or floor area during the life of the nonconformity, except as provided hereafter.

A nonconforming structure, building, or any structure or building contained a nonconforming use, which is wholly or partially destroyed by fire, explosion, flood or other cause, may be reconstructed and used for the same nonconforming use, provided that:

Notwithstanding the foregoing, should the new owner wish to change the use of the lot, building or structure to another nonconforming use, the owner shall apply to the Zoning Hearing Board for approval of the change of use. The Zoning Hearing Board shall conduct a hearing on the request within 45 days of the application. In its deliberation, the Board shall consider whether the proposed change of use is consistent with the character of the neighborhood in which the use is proposed.

If no request for extension is filed, a notice of presumed abandonment shall be issued to the record owner(s)in writing by the Zoning Officer. A challenge to the presumption shall be heard by the Zoning Hearing Board within 45 days of receipt by the Zoning Officer of a written challenge from the record owner(s) which sets forth in detail any reason or reasons why an abandonment has not occurred.

If the applicant demonstrates to the reasonable satisfaction of the Supervisors that such elimination requires disturbance of steep slopes in excess of the disturbance permitted under other provisions of this Chapter then, in that case, the disturbance of contiguous areas of steep slope which is exempted from the disturbance limitations of § 27-401, Subsection 3E, or other provisions of this Chapter shall be increased to 6,500 square feet in size and shall not be used in the calculation of the total square footage of steep slopes or the percentage of disturbance of steep slopes on a lot or development tract.

If the existing nonconforming structure to be eliminated is located between the front yard setback and the front lot line, then, in that case, notwithstanding the prohibitions of §§ 27-402 or 27-403 or other provisions of this Chapter, one single row of parking (together with a twenty-four-foot driveway for the access to said parking row) may be placed within the front yard set back provided the said nonconforming structure is eliminated.

The minimum front yard setback in the B-1 zone as applied to land development which proposes to eliminate an existing nonconforming structure which structure is located within the front yard setback shall be no more 60 feet.

The provisions of the preceding Subsection 1A through C of this Section shall only apply in cases where the structure which is to be developed to replace the existing non-conforming structure which is being eliminated is 35 feet in height or less.