The new acting commissioner of the Public Buildings Service is 48-year-old Robert J. DiLuchio.

DiLuchio joined the General Services Administration in 1971 and worked his way up to executive director of the Public Buildings Service, holding that position from 1975 to 1978. DiLuchio then spent four years in the Washington regional office as assistant administrator for administration, where he was responsible for financial matters, personnel, internal data processing and emergency preparedness activities. In 1982, he was tapped for the deputy's job in the operations office.

Acting GSA administrator Ray Kline said DiLuchio has "executive-level experience, which makes him especially well-suited to assume this position until a permanent commissioner is appointed."

To some GSA insiders, DiLuchio comes to PBS with a less than perfect reputation. During his earlier PBS days, he was regarded as overly blunt and was said to wield "autocratic power," according to one aide who asked not to be identified, "that matched the commissioner."

"I've mellowed a lot since then," DiLuchio said this week. "I see myself as a conscientious, concerned executive who tries to know just about as much . . . on the issues as the staff members who work for me."

On that count, his reputation also preceeds him.

Ira Jekowsky, an assistant commissioner, said of DiLuchio: "He's my kind of guy. He talks straight and he knows his stuff."

"He will be a very strong voice for PBS," added Charles S. (Terry) Davis, associate administrator for operations. "He'll probably be more cautious, though, in that he's only an acting commissioner."

DiLuchio, in an interview, said initially he will just try to realign the personal staff of the commissioner and establish a "paper flow for decisions that should come my way." Then, he said, he'll see what changes need to be made.

"It's too early to be more definitive," DiLuchio said.