The tenant rent is random you can very much lose money you NEED to make sure the offered rent is profitable before accepting.
Viewing post in My Maid Dreams of Electric Sheep comments
no thats not the issue. the plot costs 12k monthly. i have a contract for 20k+ earning me a weekly revenue of 9k. even if my rent were zero how could i lose 40k+ one week and 20k the next?
and now that i have the first industrial building im losing -55k a week. and yes i have contracts on both. and yes i know they are RNG and sometimes not good. guess i just gotta wait for updates.
There's land fees and then separate maintenance fees but that does sound more like a bug if it's fluctuating. There was a patch today that fixed somethings and mentioned having two of the same property. So perhaps the game at times thought you had two of the same building so you were being charged double fees?