Definitely a negative, irrespective of team
If its really close to the ground would you have some potential gain holding a club hostage for redevelopment?
I understand most of the houses close to the City Ground are owned by Forest now and are used to house apprentices (Or whatever they are called nowadays).
About 20 years ago, Tesco were redeveloping the old Hoover Building beside where I grew up beside the A40 in West London. They were buying up houses on the road which ran alongside, as that's where they were planning to build the petrol station. They were paying above market value, and people duly sold up. One guy, spotting an opportunity, decided to see how much he could get out of Tesco, thinking he had them over a barrel.
'A million pounds' was what he wanted for his house (worth no more than £150,000). He thought all he had to do was wait and Tesco would cave into his demands, as not buying the house would mean they'd have to change all their plans.
But that's exactly what they did. So then this guy was stuck living in a house, with empty properties around him. With a petrol station at the bottom of his garden.
Handy if he runs out of beer, or forgets his wife's birthday.