-- Construction stalled out at one point, but Frank Sinatra really needed an apartment for his mother, so he helped get work jump-started again.

-- Towers is plural because there were once plans to build a second tower.

Truths:

-- When the Sierra Towers first went condo in 1974, one bedrooms went for $70,500 and three bedrooms went for $152,500.

-- Post-recession, things are looking up at ST. In 2009, only one unit sold. In 2010, eight units sold, at an average of $1.6 million. And so far in 2011, ten units have sold publicly, at an average of $2.1 million. An insider says three more units have sold off market.

-- Five units, including a $9.5 million penthouse, are currently up for sale.

-- The building only has two elevators, which eighties video girl Tawny Kitaen complains made it difficult to remodel.

-- Courteney Cox recently picked up a two bedroom unit (she's downsizing from that A. Quincy Jones spread in Trousdale).

-- Both Alexis Carrington (Joan Collins) and Dominique Deveraux (Diahann Carroll) live in the building.

-- Elton John's ten month old Zachary has his own unit adjacent to John and David Furnish's unit.