Hi LaVelda - In my 1967 San Diego city and suburb directory, page 786, right column, is "Sweetland Wm (William) H (Adila M)(spouse, shown as Adila not Adina)retd (occupation - retired) h (head of household, other relations may be present) 2520 Cypress Av (residence) (LG)(Lemon Grove)".There is no phone or employer shown for Adila.The USPS zip code locator shows that address is 91945.
On the same page is "Sweetland Orwyn W (Althea M) tool planner (occupation) Convair (employer - aircraft manufacturing company now a part of General Dynamics which is a part of yet another aircraft company - employment records may exist in archival files)h 7738 Mt Vernon St (LG)".According to the zip code locator 7738 Mt. Vernon Street, Lemon Grove is the address for Sweetland Rest Home with its own dedicated zip code of 91945-2999 suggesting it may be a large facility. It sounds as if your Sweetlands own a business in San Diego for which there would be all kind of public records regarding land, property tax records, business licenses, business entity records (such as corporate filings).
On the same page is "Sweetland Fred R r 7738 Mt Vernon St (LG)".This means this Fred R. was rooming or renting from Orwyn and Althea suggesting in addition to the address and last name shared that they are undoubtedly related somehow.
In the address cross directory, page 299, right column, is "Cypress Av - 2520 Sweetland Wm H 460-6109 (telephone)".
Also on page 314, center column, is "Mt Vernon St - 7738 Sweetland Orwyn W 466-5181".Found on this page is this address surrounded by other homes with proximant street numbers to suggest 7738 is just a home on a lot in a typical neighborhood.As a rest home it appears to be in the original home of Orwyn W. Sweetland, or unless Orwyn bought up surrounding neighbors properties over the years, its likely the rest home is in a former residence only.Anyway, you might check the web using google.com to see if a "Sweetland Rest Home" gets a hit.