(b) A building nonconforming as to use regulations shall not be added to or enlarged in any manner, unless said building, including such additions and enlargements, is made to conform to all the regulations of the zone in which it is located.

(c) A building nonconforming as to height or yard regulations may be added to or enlarged if such addition or enlargement conforms to all the regulations of the zone in which it is located; provided, that a residential building nonconforming as to height regulations may be added to or enlarged notwithstanding the fact that such addition or enlargement may violate yard regulations, and a building nonconforming as to yard regulations may be added to or enlarged notwithstanding the fact that such addition or enlargement violates height regulations.

(d) A nonconforming building which is damaged or partially destroyed by fire, flood, wind, earthquake, or other calamity, to the extent of not more than fifty percent (50%) of its value at the time of such damage or destruction, may be restored if the total cost of such restoration does not exceed fifty percent (50%) of the value of the building at the time of such damage or destruction. Where the damage or destruction exceeds said value, the building shall not be repaired or reconstructed unless the entire building is made to conform to all regulations for a new building in the zone in which it is located.

(e) A building nonconforming as to restrictions set forth in § 61504 of this Chapter may be maintained and repaired but may not be enlarged, and in the case of its damage or partial destruction
by fire, flood, wind, earth quake, or other calamity, to the extent of not more than fifty percent (50%) of its replacement cost at the
time of such damage or destruction, then it may be restored if the total cost of such restoration does not exceed fifty percent (50%)
of the replacement cost of the building at the time of such damage or destruction. Where the damage or destruction exceeds said cost,
the building shall not be repaired or reconstructed.

SOURCE: GC § 17300. Subsection (c) amended by P.L. 12-160:7.

21 Guam Code Ann. REAL PROPERTY
CH. 61 ZONING LAW