<human>: Summarize the given text in a few sentences.

I'm a bit pissed but trying to gather my thoughts and stay calm and get ahead of the landlord.

Few bits of information:

* Apartment is located in Brooklyn, New York

* Privately owned by landlord

* Landlord also resided in the building

* We've been living in the same apartment for the last 5 years

Keeping the story short, we gave advance notice (45 days) that we were moving out and packed, cleaned, patched up as that time went on. Yesterday afternoon, we finalized moving everything out and did the walk through with the landlord. Outside of a few things that were our own fault, the landlord marked the apartment as good/clear. 

This afternoon I receive a text from the landlord, which is not the normal way we've ever communicated about issues regarding the apartment, that in a spot of the bedroom there was wear on the floor "beyond normal wear and tear". A point to note on the walkthrough form which we all signed is that the landlord marked the carpet/floor portion of the Bedroom walkthrough as good. 

What I'm getting from this is that the landlord is essentially finding an excuse to either withhold a certain part of my security deposit or not return it completely.

My question is what steps should I take at this point? Lawyer? Write back and contest it with the landlord?
<bot>: Moved out of apartment, did walkthrough which was cleared by landlord, a day later via text the landlord claims damage on the bedroom floor beyond normal wear and tear.