Bob Blitz, who has been building in this area for nearly two decades, is a 42-year-old "graduate attorney" whose recent efforts have been in the Potomac area. Most of his houses and those built on lots he markets are priced higher than $300,000. Currently, Blitz is offering two large houses, one a Georgian style and another a Southern colonial, on Burnwood Lane in River Oaks Farm. Lots bring about $80,000 but that's less than the $100,000 tab on lots in his Tara subsidivision. Sites there are heavily wooded and gullied. Blitz has his office in a house that was standing when he bought the River Oaks Farms site north of Potomac Village. "I bought the 125-year-old house and surrounding land from Jimmy Hoffa when he was in jail," said Blitz, who got 72 lots in the deal, made seven years ago for about $1.6 million.

An apartment building at 1728 New Hampshire Ave. NW was sold recently to Linda C. Curran for $255,000 P.P. Claxton III was the seller.

Next week the board of the America Institute of Architects is expected to put its imprimatur on the selection of David O. Meeker as the new executive vice president. Meeker, 53, an architect holding AIA's prestigious Fellow designation, was an assistant Secretary of Housing and Urban Development in the community development sector during the Carla Hills era. He will succeed William L. Slayton - whose retirement announcement was a surprise at the AIA convention this summer - the first of the year. Slayton, a former Southwest redevelopment official and former HUD assistant secretary for urban revewal, says he is still considering options for the future but does not plan to leave this area.

Property manager Leo David, who stayed at Miami's Omni Hotel during the recent realtor convention, took issue with this observer's report that the rooms are fairly small. "Gerry and I had a LARGE room with two double beds for $48, plus an extra phone in the bedroom and a large plant in the room," chides David. In defense, maybe the room looked small to this large observer, who was touring the hotel with a group at the time.

Sumner Village, a 395-unit condominium development next to Sumner's Little Falls Mall, has been sold out. The complex of medium-rise apartments, on a wooden tract between MacArthur Boulevard and Massachusetts Avenue, was designed by Cohen-Haft group, built by Thomas P. Harkins and developed by George Mulligan. Edmund C. Flynn, who heads the firm that handled sales, said prices of the last units sold ranged from $95,000 for two bedrooms to $135,000 for three. Flynn added that the resale market is brisk. When preselling began in a trailer in November, 1971, prices of two bedroom dwellings started at $42,000 and the three bedrooms at $70,000.

Let the record show that the Suburban Maryland Home Builders Association now is in a new two-story white brick building that member Ralph J. Duffie built at 1717 Elton Rd., Silver Spring. That address puts the SMHBA on the beltway near New Hampshire Avenue and in Montgomery County but almost within brick-throwing distance of Prince George's County.

Appaiser Alfred W. Jarchow, who reports regularly on price patterns of existing house sales in Montgomery County, notes moderate increases in October against September. He defines moderate as an annual rate of 8 per cent. The median price of existing houses sold dropped down to $60,000 from $65,000 in September, reflecting more sales of condominium apartments and town houses. Only 11 per cent of the resales were at prices of more than $100,000. All of those statistics seem to indicate to this observer that not all resale house priceare out of sight even in Montgomery County.