
In figure 3, which probably dates to the first
half of the 1st century BC, the earlier building had been kept while
all substructure units were changed. A
vaulted roof shown here is, again, conjectural.
The lower substructure was transformed into a two- platform system repeated
in the rebuilt mid-level platform, each with a very low basal unit.
Twin stairs were retained as in the previous structure.
The mid-level substructure had no front stair; access to the upper

The acropolis that followed (figure 4), still
in the first century BC, left lower substructure features substantially unchanged
while completely reworking the upper parts. A two-terrace upper substructure platform with
generously rounded corners now had a central axial stair. At the summit, flanking this stair, were two
thatched buildings that acted as a threshold, or gateway, to the space behind,
defined by two identical units of distinctly non-residential form. These had high building platforms with mask
panels and were almost certainly vaulted. By
Mesoamerican conventions they are “temples” presumably built to serve ceremonial
purposes. This change either indicates
a new function for the acropolis, or confirms the previous function as ceremonial
despite the residential character of the earlier architecture.
Two features seem puzzling; absence of a single
dominant element, and imbalance between east and west. The former may have been met by the whole upper
ensemble including the round-cornered, two-terraced platform with central stair; indeed this may
be the explanation for the positioning of this stair, as if the stair of the
north axial building platform in the earlier acropolis had been transferred
to the two-terrace upper substructure of this one.
East-west imbalance is harder to interpret. Perhaps the west side of the upper complex was
reserved for ceremonial activities that required open space.
The approximate time of construction and use of
this acropolis appears to coincide with initial paving of the Great Plaza, though
of relatively modest extent (Coe 1990: 818). This development would seem to indicate a general
increase in size and impressiveness of the whole ceremonial centre at Tikal,
perhaps reflecting growth in importance of the city, or alternatively, power
and status of the folks using the centre.