Petra Ecclestone, a 22-year-old Formula One heiress, is in the process of buying late TV producer Aaron Spelling's notoriously massive estate in the tony Holmby Hills area of Los Angeles. At its asking price of $150 million, Spelling's "The Manor" would have been the most expensive single-family home sale in U.S. history, though Ecclestone reportedly paid far less. Spelling's widow, Candy Spelling, had the house on the market for two years before the British heiress stepped in. Here's a by-the-numbers look at what Ecclestone is offering for her spacious second home:

$150 million
2009 asking price for the estate

$85 million
Price Ecclestone paid, according to TMZ

$4 billion
Net worth of Ecclestone's British father, Formula One CEO Bernie Ecclestone

Square footage of The Manor

Number of rooms, including rooms reserved for flower-cutting, china display, a beauty salon, and "several" gift-wrapping rooms

Acreage of the property

Number of parking spaces in the motor court and 16 carports

Seats at dining room table

Bowling lanes in the house

Number of maids' bedrooms and butlers' suites in a service wing

No. 2
Petra's preferential ranking of the Spelling estate, after Suzanne Saperstein's nearby "Fleur de Lys"

$125 million
2007 asking price for the still-available Fleur de Lys

$100 million
Price paid for a Silicon Valley house earlier this year, by Russian Yuri Milner

$91 million
Price Petra Eccleston paid for her other home, a six-story townhouse in London's Chelsea neighborhood

$35 million
Price Candy Spelling paid for her new home, a condo in nearby Century City

$1 million
The amount Spelling kids Tori and Randy inherited in 2006

Sources: Wall Street Journal, Business Insider, Los Angeles Times, TMZ, Huffington Post, People