A woman spent $25,000 to build a room hidden behind a bookcase in her apartment - here's what it's like inside

Jacob Shamsian/INSIDER

Sara Nainzadeh always wanted a secret room. When renovating an apartment she purchased in 2009, she realized she had enough space to build one.

"When I got this apartment, I knew I could utilize two of the three bedrooms," Nainzadeh, who works in finance, told INSIDER. "And I thought I wanted the third space to be an office space."

The third bedroom did, in the end, become an office space. And a lounge to hang out with her friends. You just have to get there by pulling a book off a shelf. With the help of the company Creative Home Engineering, Nainzadeh got herself her secret room.

Take a look inside: