The far greater proportion of the building was occupied by the theatre
(значительно б'oльшую часть здания занимала операционная; proportion – пропорция; часть, доля), which filled almost the whole ground storey (которая заполняла почти что весь первый: «земляной» этаж), and was lighted from above (и освещалась сверху), and by the cabinet (/оставшуюся часть занимал/ кабинет), which formed an upper storey at one end (который образовывал верхний этаж/ярус в одном конце зала = который находился на антресолях) and looked upon the court (и окнами выходил во двор). A corridor joined the theatre to the door on the by-street (коридор соединял операционную с дверью /которая выходила/ в переулок); and with this, the cabinet communicated separately by a second flight of stairs (а с ней /с дверью в переулок/ кабинет отдельно сообщался второй лестницей; flight – полет; пролет лестницы). There were besides a few dark closets and a spacious cellar (кроме того, в здании располагались несколько темных чуланов и просторный подвал).
“We have come too late,” he said sternly, “whether to save or punish. Hyde is gone to his account; and it only remains for us to find the body of your master.”
The far greater proportion of the building was occupied by the theatre, which filled almost the whole ground storey, and was lighted from above, and by the cabinet, which formed an upper storey at one end and looked upon the court. A corridor joined the theatre to the door on the by-street; and with this, the cabinet communicated separately by a second flight of stairs. There were besides a few dark closets and a spacious cellar.