The planning commission shall render a decision on the preliminary
plat within thirty (30) days after its submission to such commission
unless such time is extended by agreement of the subdivider or his
agent. Such decision may consist of approval, disapproval, or conditional
approval. Conditional approval shall be considered to be the approval
of a plat or replat subject to conformity with prescribed conditions,
but shall be deemed to be a disapproval of such plat or replat until
such conditions are complied with. All objections made to the preliminary
plat, or conditions imposed, shall be furnished to the subdivider
in writing. If no decision is rendered by the commission within a
thirty-day period described above or such longer period as may have
been agreed upon, the preliminary plat, as submitted, shall be deemed
to be approved.