Sentence:  ... proposals for erecting 500 Publick <WSD>Offices</WSD> of Ease in London and Westminster... 
Meaning of the word marked with <WSD> tags:  The parts of a house or estate devoted to manual work and storage, as the kitchen, scullery, laundry, stables, etc., "particularly" (dated) a house or estate's facilities for urination and defecation: outhouses or lavatories.