The non-executive chairman of Derwent London sold £13.8m worth of shares in the property investment and development group.Robert Rayne sold a total of 400,000 shares in two transactions for 3,451.80p each, pocketing a total of £13.8m.200,000 shares were sold by Rayne directly, while 200,000 were offloaded through Withers Trust Corporation.Following the transaction, Rayne still holds 3.277m shares, which represents a 2.96% stake in thecompany.Derwent said last week recent strong letting activity drove its vacancy rate down to 1.9% during the first-half of the year from 4.1% in December.The group had said in the statement that time would tell if the general elections would affect the central London office market. Panmure analysts said they believed the commercial property market would favour a Conservative result. Top Director BuysBank of America Corp. (BAC) Director name: Mr Jack O Bovender JrAmount purchased: 18,416 @ $16.29 Value: $299,997Berkeley Group Holdings (The) (BKG) Director name: Mr Sean Ellis Amount purchased: 6,927 @ 2,712.00p Value: £187,860Bank of America Corp. (BAC) Director name: Mr Sharon L AllenAmount purchased: 9,821 @ $16.29 Value: $159,984Bank of America Corp. (BAC) Director name: Mr Susan S. BiesAmount purchased: 9,821 @ $16.29 Value: $159,984Bank of America Corp. (BAC) Director name: Mr Arnold W DonaldAmount purchased: 9,821 @ $16.29 Value: $159,984Matomy Media Group Limited (DI) (MTMY) Director name: Mr Ofer DrukerAmount purchased: 50,000 @ 135.75p Value: £67,875Cambria Automobiles (CAMB) Director name: Mr Philip Swatman Amount purchased: 85,000 @ 59.25p Value: £50,362Keywords Studios (KWS) Director name: Mr Ross King GrahamAmount purchased: 27,950 @ 161.00p Value: £45,000Atlas Mara Limited (DI) (ATMA) Director name: Mr Robert E. DiamondAmount purchased: 2,777 @ $6.25 Value: $17,356Atlas Mara Limited (DI) (ATMA) Director name: Mr John VitaloAmount purchased: 2,222 @ $6.25 Value: $13,888Top Director SellsDerwent London (DLN) Director name: Lord Robert RayneAmount sold: 400,000 @ 3,451.80p Value: £13,807,200InterQuest Group (ITQ) Director name: Mr Mark BraundAmount sold: 250,000 @ 90.00p Value: £225,000Costain Group (COST) Director name: Mr Andrew WyllieAmount sold: 53,968 @ 328.87p Value: £177,485Costain Group (COST) Director name: Mr Andrew WyllieAmount sold: 52,294 @ 328.87p Value: £171,979Costain Group (COST) Director name: Mr Anthony BickerstaffAmount sold: 34,645 @ 328.87p Value: £113,937Costain Group (COST) Director name: Mr Anthony BickerstaffAmount sold: 34,066 @ 328.87p Value: £112,033SThree (STHR) Director name: Mr Justin HughesAmount sold: 7,500 @ 386.58p Value: £28,994SThree (STHR) Director name: Mr Justin HughesAmount sold: 5,000 @ 383.70p Value: £19,185