With no explanation, label each line with "O", "location-road/railway/highway/transit", "organization-company", "location-GPE", "event-disaster", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
``
When
the
original
Second
Empire
style
headquarters
on
the
corner
of
Baltimore
and
Calvert
street
was
destroyed
in
the
Great
Baltimore
Fire
of
1904
,
Baltimore
&
amp
;
Ohio
Railroad
executives
decided
to
build
a
new
13
story
steel-framed
building
two
blocks
west
of
the
old
site
.
``:O
When:O
the:O
original:O
Second:O
Empire:O
style:O
headquarters:O
on:O
the:O
corner:O
of:O
Baltimore:location-GPE
and:O
Calvert:location-road/railway/highway/transit
street:location-road/railway/highway/transit
was:O
destroyed:O
in:O
the:O
Great:event-disaster
Baltimore:event-disaster
Fire:event-disaster
of:O
1904:O
,:O
Baltimore:organization-company
&:organization-company
amp:organization-company
;:organization-company
Ohio:organization-company
Railroad:organization-company
executives:O
decided:O
to:O
build:O
a:O
new:O
13:O
story:O
steel-framed:O
building:O
two:O
blocks:O
west:O
of:O
the:O
old:O
site:O
.:O