Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Earliest Italian Architecture
The elements of architecture were, as has been already indicated, a primitive common possession of the stocks. The dwelling-house constitutes the first attempt of structural art; and it was the same among Greeks and Italians. Built of wood, and covered with a pointed roof of straw or shingles it formed a square dwelling-chamber, which let out the smoke and let in the light by an opening in the roof corresponding with a hole for carrying off the rain in the ground (-cavum aedium-).
Under this "black roof" (-atrium-) the meals were prepared and consumed; there the household gods were worshipped, and the marriage bed and the bier were set out; there the husband received his guests, and the wife sat spinning amid the circle of her maidens. The house had no porch, unless we take as such the uncovered space between the house door and the street, which obtained its name -vestibulum-, i. e. dressing-place, from the circumstance that the Romans were in the habit of going about within doors in their tunics, and only wrapped the toga around them when they went abroad. There was, moreover, no division of apartments except that sleeping and store closets might be provided around the dwelling-room; and still less were there stairs, or stories placed one above another.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/1-15-art.asp?pg=30