1154                            Laws of Maryland                      [Ch. 350

portion to the several counties and cities such part of the value
thereof as is reasonably attributable to the parts thereof located in
each such county or city. Operating property not permanently
located in any county or city, shall, insofar as is reasonably consis-
tent with a just and fair apportionment, be apportioned to counties
and cities in proportion to the valuation and location of permanently
located operating property directly apportioned. Any such operating
property not permanently located in any county or city, including
mobile operating property, which cannot fairly and just be so appor-
tioned, shall be apportioned to the county and/or city in which the
owner resides. In computing the assessment for purposes of county or
city taxation of operating property (except land), other than operat-
ing property (except land) assessed as provided in paragraphs (e)
and (f), in any county or city, the Department shall deduct from so
much of the aggregate value of the operating property as is apportion-
ed to such county or city, the assessed value of operating land located
in such county or city and included in such operating property, and
shall also deduct such part or parts of such operating property located
in such county or city as are exempt from county or city taxation
under Section [9] 9 A of this Article or any special act or acts, and
separately valued under paragraph (c).

19.

(a) (1) In valuing and assessing real estate, the land itself and
the buildings or other improvements thereon shall be valued and
assessed separately; and buildings or improvements not substantially
completed on the date of finality, semiannual date of finality or
quarterly date of finality shall not be assessed at all. Provided
further, however, that land may be reassessed whenever it has been
subdivided or the character or use is changed after the date of finality
but before the semiannual date of finality. The recording of a plat
which is necessary for the purpose of construction of streets, water
or sewer facilities shall not constitute a change in use or character
except for the purposes of description and recording dual assessments
as required by subsections (b) and (f) of this section.

(2)    Any seawall, bulkhead or other structure for the exclusive
purpose of preventing shore erosion or to prevent damage by wave
action of any body of water shall not be considered an improvement
unless the said seawall, bulkhead or structure is a part of some other
building or improvement.

(3)    In case of the separate ownership of the surface of land and
of minerals or mineral rights therein, the assessing authority may, in
its discretion, make separate rate assessments of the value of the
surface and of such minerals or mineral rights.

(4) Every artificial barrier, commonly called a dam, which may
be constructed across the Potomac River near the mouth of the
Monocacy River in Montgomery County within the State by any
electric power company shall not be included in the valuation of any
property of the company owning the barrier for purposes of State
and local taxation.

(5) (A) Any structure outside of another building, or any
underground, or partially underground, addition to any existing build-
ing, or any underground, or partially underground portion, of a newly
constructed building, which constitutes a radiation fallout shelter,
and which is used for no other purpose, shall not be included in the