The Sew Ikiid-ng l) Front of the Herald Office. . . _«*»u -An cxfcnsioiirof the building now occu~ pied bv ihe 1° to Too mude,*“ * ** ? 'aj -onnhc west front * nnct ‘tlic tvork ot'oxfea-vation has been already commenced ilr.Wl’jgley, the architect, has furnished us with a general plan uud description of the .contemplated -improvement,' by which it will be’secn that the proprietorrMr. Cr. 3xi •Anderson, intends to construct the new building in 'jfrery substantial 'and handsome style. The material will be of pressed brick, iron, and cut stone. Its dimensions will be 40 feet front on Spring and Diamond streets, and two stories, 14 and 12 feet high.* The doors, window frames, sn-di, e., Vdlbe of black walnut, aU gla/ed with French plate glass, the lowe^vwindo w - upeiitEgs* one solid sheet. An iron doar will close it from the PostOlSee. The roof will' be- tinned, * The*bailduur will contain a..substantial vault ofw • r _ v xcut stone and iron, and the desks and inside furniture will be of walnut and plate gln«*- Altogether, the new building will boouo of great solidity, and Unishcd m highly ornamental style: _ J ,