Ballpark cost/SF for Bay Area (San Jose) multifamily construction

[Kevin D.]

I have found an opportunity on a property which i feel is underutilized.  My theory is that the property which currently contains two small duplexes could be demo'd and redeveloped with 8-12 units to increase cash flow, possibly dramatically increase property and asset value, and bring in higher quality tenants.  My experience is in single family real estate, not multi family and not new construction so...

My ask is this, while I'm able to estimate current and post development value as well as minor rehab costs I am not knowledgeable on the estimating new construction, design, development costs.  I am asking to see if there are BP individuals out there willing to provide me some counsel on this subject.  I welcome anyone qualified to provide detailed estimate information or even ballpark typical costs.  

Here are some details:

1. Current buildings to demo are approximately 2600 sf
2. Lot size is 10,700 sf
3. I'm assuming 10 units at 700 sf each to arrive at 7000 sf of new construction
4. Construction type will be timber, shingle roof, low-grade fixtures, and dual pane windows, linoleum flooring, inexpensive countertops and cabinets
5. There is already a driveway along the property line to access side facing units.  I'd presume to reuse this driveway and perform a simple seal/coat 
6. Since I'm increasing occupancy and since the property structures are old, I'm anticipating having to improve the sewer connection.  If anyone has ballpark numbers for this...
7. I do not know status of water service, still gathering information.
8. There are currently 4 gas meters so I anticipate needing to bring more gas services on line.  

Thanks for any assistance or guidance anyone can provide.   Kevin

[Radhika M.]

Did you checking the Zoning for the property with the county/city? If you have not done it you should start there.