Seems that one construction project was enough. Three months after Will Arnett sold his custom-built modular home for $8 million to actress Claire Holt (“The Vampire Diaries,” “The Originals”) and her private equity guru husband Andrew Joblon, the veteran actor/standup comic has eschewed building another house in favor of buying an all-new mansion built on speculation. Records reveal he’s plunked down $16.4 million for a trendy “modern farmhouse” structure in the hills just beyond the Beverly Hills city limits, and just around the corner from Jeff Bezos’ $165 million estate.