Noise control for Opera Singer’s apartment practice?

Hello!

Question: How can I reduce sound of me singing opera coming out from my apartment?

First time posting here. I’m an opera singer currently living in a co-op around the Bay Ridge area. I’ve been living in the city for 8 years and practicing at home with no issue, until now.

I’ve been practicing in the living room, which has a small entryway that has the door that leads to the hallway, hallway is on the second floor, which has a balcony connecting to the lobby.

I am aware of the NYC noise code and how it protects musicians, but interactions with passive aggressive neighbor notes threatening to call 311 and pressure from the building management company as well as getting the cops called on us twice (once for practicing, other one 4 minutes after 10pm while playing cards with friends, clearly a vengeful move, it was not even that loud.

I want to make sure I take some steps to reduce sound as best I can, so I don’t pass the 10db above ambient noise violation.

Even though the law states I’m allowed to practice during reasonable hours (7am to 6pm) I only ever practice from 11 to 5pm. Frequency of practice is usually once a week, and length is never more than an hour. However, I want to be able to practice one hour every week day. Also, singing softly or less is not a real possibility. Sounds need to be produced fully. My average decibels according to my teacher is 70db from a distance of 10 feet with nothing between me and the phone he was recording measuring with. Apparently ambient noise levels in Bay Ridge are 45 to 55 dBA.

There has been no effort from neighbors to contact me directly. And I’ve taken steps to address the practice with the building manager. I tried leaving a note on my door when we moved in about my practicing, with my phone number to reach out, but the building prohibits such notes on our doors or hallways.

After all this hefty context, my question is: how can I reduce the outgoing noise from my apartment effectively?

Steps taken:

• I’ve covered 80% of the floor in carpets, as per the building’s policy, and put a heavy blackout curtain covering the path to the entry “hallways” that leads to the door to exit the apartment.

What I’m thinking on doing:

• I want to change my keyboard and “singing station” to the bedroom, which would require some serious reshuffling of furniture, but it would provide another wall between me singing, the hallway, and the grumpiest neighbor I got next door.
• Putting some sort of heavy cover between my bedroom door and the living room, but I want to make sure what I pay for and how I install it actually helps the issue.

Also worth mentioning, my partner plays the euphonium and the trombone, but he only plays like once a month or so, and always in the bedroom.

Thanks so much for reading that crazy essay, and looking forward to all thoughts about this :)