INVESTOR LIFTS MYERS <MYR> STAKE TO 12.1 PCT Leonard Chavin, a Chicago real estate developer who has said he is considering seeking control of L.E. Myers Co Group, said he raised his stake in the company to 273,100 shares, or 12.1 pct, from 219,600, or 9.7 pct. In a filing with the Securities and Exchange Commission, Chavin said he bought 53,500 Myers common shares between March 10 and 31 at prices ranging from 5-1/2 to six dlrs a share. Last January, Chavin said he retained investment banker R.G. Dickinson and Co to advise him on his Myers stock dealings. He has also said he would be unable to seek control of Myers unless he gets financing.