According to this post the next transmission center is being sold and dismantled.
https://vk.com/public158109176?z=photo-158109176_457240190%2Falbum-158109176_00%2Frev
“Leningrad region. Radio center #11 Krasny Bor.
Before you is a transmitter broadcasting the program “Radio Teos” at a frequency of 1089 kHz.
Stopped in 2016. It was the last working transmitter.
The radio center is being dismantled. The land is being prepared for sale”
Marco (2023-05-22)