The D.C. zoning commission postponed a final decision yesterday on a massive rezoning for the Dupont Circle area after commissioners could not agree on whether to permit six-story buildings or five-story buildings on Connecticut Avenue north of the Circle to Florida Avenue, among other things.

The three zoning commissioners who sat in on months of hearings and who are to vote on the rezoning reached several tenative decisions during their meeting yesterday afternoon and on March 15, and have scheduled a final vote for April 12.

Their tentative decisions include reducing the density and height of buildings permitted on 16th street between Scotts Circle and Q Street NW, as well as south of Massachussetts Avenue between Rhode Island Avenue, 17th, 18th and N streets NW.

The proposed rezonings will change heights and densities that have been allowed since 1958, and represent one of the most complicated and controversal cases ever considered by the zoning commission.

For more than six years, a coalition of citizens groups in the area - between Florida Avenue, M, 15th, and 23rd Streets NW - have pushed for a "downzoning" for much of their neighborhood, claiming that the infiltration of high-rise office buildings is destroying their community and displacing its residents.

The downzoning is opposed by numerous property owners, developers, and businessmen who feel that the changes will lead to the erosion of the city's tax base and will have an adverse impact on jobs and transit revenues at the Dupont Circle Metro station.