bro ke ▁Est ate . ▁Working ▁with ▁the ▁architect ▁and ▁survey or ▁Thomas ▁All ason , ▁Lad bro ke ▁began ▁to ▁lay ▁out ▁streets ▁and ▁houses , ▁with ▁a ▁view ▁to ▁turning ▁the ▁area ▁into ▁a ▁fashion able ▁sub urb ▁of ▁the ▁capital ▁( although ▁the ▁development ▁did ▁not ▁get ▁seriously ▁under ▁way ▁until ▁the ▁ 1 8 4 0 s ). ▁Many ▁of ▁these ▁streets ▁bear ▁the ▁Lad bro ke ▁name , ▁including ▁Lad bro ke ▁Gro ve , ▁the ▁area ' s ▁main ▁north – s outh ▁axis , ▁and ▁Lad bro ke ▁Square , ▁London ' s ▁largest ▁private ▁garden ▁square . ▁ ▁The ▁original ▁idea ▁was ▁to ▁call ▁the ▁district ▁K ens ington ▁Park , ▁and ▁other ▁roads ▁( not ably ▁K ens ington ▁Park ▁Road ▁and ▁K ens ington ▁Park ▁Gard ens ) ▁are ▁rem ind ers ▁of ▁this . ▁The ▁local ▁tele phone ▁prefix ▁ 7 7 2 7 ▁( origin ally ▁ 7 2 7 ) ▁is ▁based ▁on ▁the ▁old ▁tele phone ▁exchange ▁name ▁of ▁P AR k . ▁ ▁Lad bro ke ▁left ▁the ▁actual ▁business ▁of ▁developing ▁his ▁land ▁to ▁the ▁firm ▁of ▁City ▁solic itors , ▁Smith , ▁Bay ley ▁( known ▁as ▁Bay ley ▁and ▁J anson ▁after ▁ 1 8 3 6 ), ▁who ▁worked ▁with ▁All ason ▁to ▁develop ▁the ▁property . ▁In ▁ 1 8 2 3 ▁All ason ▁completed ▁a ▁plan ▁for ▁the ▁layout ▁of ▁the ▁main ▁portion ▁of ▁the ▁estate . ▁This ▁marks ▁the ▁gen esis