I’ve made an offer on a flat. How much negotiating is enough

[Pokster]

First time buying here with mortgage.

We offered 10 grand less he will take 5 less so I will go back with 7000 less so 2 grand lower than what he will go for. What a crap way for me to explain it.

Reason being there are potential future lease renewal costs

I assume that the remaining lease is long enough to let you get a mortgage??