Renovation on first rental property

[Tim Lee]

I'm excited to be currently renovating my first rental property!  Apart from painting, replacing toilets, etc (and also addressing mold issues), the general contractor is also adding a wall to make the property a 3/2 again (prior owner took down a wall to make it a 2/2).  What documentation do I need from the general contractor to differentiate things that can depreciated vs. deducted?  I'm looking to meet with a CPA, but that's likely after the renovation is completed.  Thanks!