Old romance - lost

[020104isme]

One in a million that anybody remembers this. I read a book in the 90s where the female heroine had hidden a figurine by Michelangelo as a child but didn't remember doing so. Book was set in the modern day where she fell in love with someone from the family that had owned the statue.

Please help me find the title!

[snaregirl]

I read this book a couple of years ago and I think it's YA. It's about a teenage girl who tries to steal gold from a building with the help from her techy guy friend. I remember that she had to coat herself in something cold so she wouldn't be detected by the security cameras. At the end, the gold was at the top of the building. I think "heist" was in the title, but I'm not too sure. Thanks