Federal housing officials have concluded that Alexandria's 1984 decision designating the black neighborhood of Parker-Gray a historic district "was specifically intended to displace low- and moderate-income blacks," from their homes, according to a document released yesterday.

This was among the findings reached by investigators of the U.S. Department of Housing and Urban Development looking into a formal complaint to the agency from some Parker-Gray residents.

The law "can only be read as a 'green light' to developers that the time has now come to 'renew' Parker-Gray in the same manner as the originial Old and Historic District, and that they will have the tacit support of the city in doing so," the summary said.

The report noted that the refurbishment of Old Town in the last two decades has displaced many low- and moderate-income blacks.

Those findings, reached in late 1986, appear to support claims by the Parker-Gray residents that their neighborhood, one of the city's oldest black areas, is jeopardized by city policies.

Last month, HUD dropped its efforts to resolve the dispute between city officials and the Parker-Gray residents, saying they were "administratively closing the case . . . as an unsuccessful conciliation." The residents were free to pursue their grievances in court, HUD said.

Alexandria Mayor James P. Moran Jr. declined to comment yesterday on the findings, saying he had not read them and citing the possibility of legal action by the Parker-Gray residents, organized as the 16th Census Tract Crisis Committee.

Attorneys for the committee could not be reached for comment yesterday.

"I don't think it was the intent of council to discriminate against families in that area," City Manager Vola Lawson said. Its action was aimed at "discouraging people from buying up land for commercial development and preserving {Parker-Gray} as a residential area," she added.

Lawson noted that some black residents supported the council's action.

One of the criticisms of opponents was that, as a historic district, residents in Parker-Gray faced added costs for home improvements because they had to meet requirements of an architectural review board.

But Lawson said Parker-Gray residents with incomes less than $30,500 are eligible for grants up to $30,000 for home improvements to help offset those added costs.

The HUD report said that city officials had enough information before their 1984 action to foresee its effect. That included census data, an opinion by the city's planning department that the law would have a disruptive effect on longtime Parker-Gray residents and the city's recent experience in Old Town, where development forced displacement of many blacks.

"It appears that the {creation of the historic district and the city's} development plans were specifically intended to displace low- and moderate-income blacks, along with others from the 16th Census Tract, in order to upgrade properties {and} . . . to promote the rise of property values and attraction of new residents," the report said.

Other, less drastic means could have been used by the city, the report said, to preserve the "few buildings . . . to be protected."