New builders next door built a fence on my property

[James Wash]

I just recently bought a brand new Duplex in Tucson,AZ and the builders next door put up a fence on my property. The fence is stealing about 4-5 feet into my property according to the surveyor. The build next door is a single family home and is currently for sale. 

What are my options to solve this problem? I am a new investor and this is my first hurdle. For some reason I thought if I bought new I wouldn't come across any problems, boy was I wrong!

Thank you!!!