Hello Ruby and thanks for your question.
Based on what I can find on the internet, Siena's townhome properties appear to be attached housing in a planned development., which, as you know, means that a buyer would purchase both the lot and the building. There's an easy way to determine if the homes are condominium styled townhomes or a planned development. Open the CC&Rs, and look under the "definitions" section of the governing documents--usually the first few pages. If the homes are identified as "Lots", then the community is a planned development. If the homes are identified as "Units", then the homes are actually condominiums--the word "unit" connotes a condominium or three-dimensional "box of air" described on the condominium map and plan. This is why the words "planned UNIT development" is incorrect--the term is actually "planned development."
At this time, to determine if the homes within the Siena community are an attractive buy, you may wish to consult with a local real estate agent in the area to look at several other homes and to obtain comparables to determine if the pricing for the home in which you are interested is justified or a good buy. I can say, however, that with a peak price of $650,000 or more for homes in this community, the current prices in the high $400,000s are very certainly attractive. However, "how" attractive will depend entirely on the recent sales in the area.
Grace Morioka, SRES, e-Pro
Area Pro Realty
San Jose, CA