Phoenix AZ Multifamily development feedback

[Jonathan Orr]

Hi BP, looking to speak with someone (architect, developer, contractor, broker/agent).  I have a mixed use development in the East Valley that was brought to me.  I have not developed MF in Phoenix Arizona so looking to get some feedback on if I am on the right track for costing. I want to get a better idea on if I am over estimating since I primarily work in CA with some ridiculous Construction numbers
This is very early in the project so just looking for proforma numbers, nothing concrete.
Project description:
Flat lot
Units 250-300 units (multiple buildings) (~230,000 sq ft in total)
Type V construction 3 story walk up
Surface parked with some covered parking
Utilities stubbed to property line
Flat roof
Some amenities (pool, clubhouse, etc...)

For hard construction only I am estimating around $135/SF
Roughly $200k for site work

Any help is appreciated.