A recent major transaction involving an assemblage of property on the south side of L Street NW, just west of Connecticut, was handled by veteran Sol Wolberg of Shannon & Luchs. Wolberg said that the transaction involving lots with a total of 12,308 Square feet amounted to nearly $2 million at an average of about $150 a square foot. The buyer is Washington Square Limited Partnership and the sellers were MLG Trust, M. E. Ediavitch and the heirs of L. J. Heller. This could be a signal that a major project is coming for that area.

Things change. Now Joan G. Day Ltd. has the exclusive listing on the mansion that is being completed on a big lot on Chain Bridge Road in the Merrywood section of Northern Virginia. The price tag is in the millions. . . And builder Gilbert Schultz, whose owner-built house with many special features was highlighted in this section some weeks back, reported that the house in the Ashton Pond area of Montgomery County has been sold for $214,000, with settlement scheduled for April 2.

For some years, commuters along Connecticut Avenue in Chevy Chase have been wondering about that big new house at 6705. It is notable for a mansard roof, "two bay windows and a pillared portico and semi-circular driveway in front. Well, it was sold recently for $560,000 to the Federal Republic Nigeria to be the residence of that country's ambassador. Louis G. Baier of Radcliff Real Estate Co., Inc., negotiated the sale for owner Edward Stephens.

A recent report from the Agriculture Department shows that the market value of U.S. agricultural property increased 17 per cent, from $380 to $445 an acre, in the year ending last Nov. 1. The increase in Maryland was 16 per cent to an average of $1,460 an acre and 3 per cent in Virginia to $664 an acre.

In real estate less that two years, Edward Middleton, 26, has gained a reputation as a whiz in getting listings of properties for sale. His January commissions with the Mount Vernon office of Rough Robbins Realtors hit $3,000. Does he have a secret? "None. Just deligence, no kidding. I make a lot of 'blind' calls and get results. I'm always on the phone. It's a demanding business that takes a lot of time. But the market is good so I work hard."

Remember when home shows were held at the D. C. Armory by area builders? Eleven years ago, John P. Aylor, who died recently at 60 in Fort Lauderdale, was the chairman of the home show, working closely with the late James W. Pearson, who was executive of the area home builders. Mr. Ayler built in Prince George's County for 25 years and one of his communities, Maplewood, was cited for excellence by Life magazine. James J. Aylor , now sales manager of the Page Corp. of U.S. Home here, is a surviving son.

Real esate transfers increased 23 per cent in Loudoun County last year over the 1975 total. Deed Fax, a Manassas realty publishing firm, reported 2,037 deeds recorded in Loudoun last year as compared with 1,685 in 1975.

There's a difference between families and individual persons. Everyone knows that. Well, there are also differences in statistics. For years, the statistics on American families living in their own homes ranged over 60 per cent, with the figure now reliably about 64.8 per cent. But a new figure of 75 per cent ownership has been heard. That means simply that 75 per cent of all Americans live in dwellings owned by themselves or their families. If a couple with no children occupies a dwelling as an owner that's one family ownership but so is a family in its own house with eight children. But in the prior category, only two individuals are involved and in the other case, the figure is 10. Obviously more individuals than families are in their own homes.

Recent realty transactions in this area include the sale of the Town House Square apartments in Dumfries, Va., by D. T. Hutman, trustee, to Triangle Co. of Virginia for $1,047,000 . . . L. R. Cowne and others recently acquired 372 acres near Brentville, Va., for $526,668 from the Daniel Loughran Foundation . . . And C. Caviness sold a 4-acre parcel with improvements on Route 234, west of Manassas, for $385,000 to A. F. Otero, J. P. Minogue and T. A. Miller.

At the Rossmoor Leisure World in Laguna Hills in Claifornia, 800 prospective buyers showed up recently and 121 purchasers were selected by lottery in less that six hours for more than $9 million in sales with the average price at $74,000. The dwelling are apartments, townhouses or combinations thereof. No single houses. There's also a Rossmoor adult community, with new models being shown, in the Norback area of Silver Spring, where sales have been strong. But no lottery.

The National Association of Home Builders has named 18 persons to its newly constituted Housing Hall of Fame. Area persons include Sen. John J. Sparkman (D-Ala.), sponsor of considerable housing legislation over the years; widely respected J. Stanley Baughman, retired president of the Federal National Mortgage Association and still a resident of Bethesda; the late Edward R. Carr of Northern Virginia, a past national president of both NAHB and the Nationl Association of Realtors (and father of area builder Edward R. Carr), and Joseph Meyerhoff, a Baltimore builder.

Veteran builder Jack Alfrandre is not one afraid to admit making a mistake, especially when the correction takes care of the problem.He opened models priced in the upper $60s and low $70s at Stratton Woods, adjacent to Reston. Sales were slow. So he built new models, smaller and prices about $12,000 lower. "We had 45 sales contracts in two recent weeks. How about that? I think we overshot the market in the beginning."

Thomas E. Anderson, executive director of ERA, a franchise real estate operation with 10 participating brokerage firms in Northern Virginia, took exception to a recent mention of the buyer protection plan offered by ERA (Electronic Realty Assocites) in a story in this section. He said that in the case cited the buyer had the ERA policy in force but also had conventional homeowner insurance. "We paid the full claim but felt that our program should stand only for the cost of the work to replace the bad pipes and that the homeowner's insurance should have covered the incidental tiling and woodwork repairs because that policy covers that expense to the homeowner. The policyholders, for reasons of their own, chose not to use their homeowner insurance coverage for that portion of the claim," said Anderson.