He is the Muhtar for Foca - not sure if that is your area - it says Gunlukbasi on our Tapu but we come under Foca - best to see if it says Foca on your electric or water bills?
The man was called Atay and as Diverbaz says he is very helpful.
I went to see him yesterday to do with "change of address" - I think you will find it is on Sokak 953 - next door to a barbers and then a little place where the men sit outside playing backgammon.
Be prepared to pay - I don't think they have any set charges - in fact he appeared to be letting me walk away as another person came in and as an "afterthought" I said "kac para" to which he smiled and said 30 TL lutfen!