By Zeus, Don , what an impressive, well-written work of scholarship!
I was particularly caught by this: “ … large enough to attract the attention of Memmius, a well-to-do Roman citizen, who wanted to raze the property and construct his own villa on the site.” Now, Epicurus’ abode may not have been as extensive as a villa, but this would indicate that either (1) a significant portion of the plot on which his house existed was the grounds (cultivated? how?) , and/or (2) Epicurus’ house may have been a bit more than a humble cottage.