Pro-Forma Breakdown of Costs?

[Thierry Van Roy]

So in developing a more automated pro-forma deal analysis, I'm trying to set up standardized cost breakdowns for multifamilies. Yes, anything from fourplex to apartment and also broken down in pessimistic, neutral and optimistic scenario's.

Are there any lists out there that give a realistic estimated breakdown of costs? I want this set up so I can tweak it continuously while comparing to CAPEX and replacement.

An example would be:

monthly replacement reserves / unit = A * [.75 + .25 (#bedrooms)]

(in which A is pessimistic/neutral/optimistic 75/100/125 USD)

This is supposed to be pre-due diligence, but also so I can compare the outcome to the pro-forma. (Example: this new boiler with decalcifier lowered maintenance by 30%, increasing NOI by 2%.)

Just to be clear: I don't expect you guys to come up with the numbers yourselves. I'm assuming lists with this kind of data already exists, but I can't find any serious data anywhere.

(And no, I don't want to use the 50% rule instead.)