For really high end finishes and upgrades, count on $300 per sq. ft.So, if you are talking mid level higher end homes in CA and just the interior (no windows, stucco, roof, foundation,  landscaping, etc) then the price is under those figures.In my Beverly Hills flip, it is just over 3000 sq. ft. and the interior portion of the rehab (demo, architectural design, engineering, rough framing - added load bearing beams, moved load bearing walls, low voltage wiring, rough electrical and plumbing (some existing is used) or repositioned), finish electrical and plumbing, flooring (wood) plus tile in bathrooms and kitchen, new interior solid core doors and hardware, drywall (about 40%- 50% of existing was used), paint, custom cabinetry with custom stain, cabinet hardware, kitchen appliances - Viking) all of this will run me about $250k or just over $80 per sq. ft. not including any permit fees or project manager fees.Now, I am also doing new windows and exterior doors and sliders, roof, landscaping, decking, BBQ buildout, etc. and my total budget is $350k ($113 per sq. ft.) 

This could be quite useful in setting rents or deciding if an improvement/upgrade might be profitable or might be a good competitive choice.

Might be too expensive to do and someone told me to just put tile down in areas that has been broken and don't do the removal.

I just dont feel a seller should fix capital items that arent broken, especially when i had a licensed hvac specialist confirm in writing the units are operating correctly, and seller is providing a home warrantee for the buyer already. 

@Hailey Brown, I know I am going to sound like a broken record here but our three colleagues that responded above me are all absolutely right. 

I know that banks usually don't lend on a property that is in pretty bad condition, so we've been looking at places just need cosmetic upgrades like kitchen, bathroom, finishing a basement or mud room, landscaping, etc.

Over the next 12 months, we will be implementing financial and operational procedures, on-boarding the asset to 4M Capital’s platform, and carrying out capital improvements.Major Deficiencies:-8 down units (demo'd to studs)-High vacancy and delinquency-Poor management-Deferred maintenance  Upgrades / Capital Improvements-Bring down units online-Install new heat and air systems -Install new doors / windows-Add amenity package-Upgrade kitchen / bathroom / appliances -LandscapingDeal Economics Construction BudgetA few cool shots with the drone.. don't let the dreary weather fool you, this is a great property on a fantastic piece of land, just needs a lot of elbow grease and a little TLC.   

Then you hold that for a few years, do a value add play on the property through better management and upgrades and you refi out and payoff the sellers fully.

So I'm sticking with desktop.They're phasing out desktop and you have to upgrade it every 2 years now.

I like to rent it to students or young working professionals. no section 8 etc. venmo; facebook; square cash as primary rent payment method is a must thing. if you upgrade each unit with occupancy sensor for heating and electric, and coin operated laundry would be great as well.