Multi-Family Cost Dataset

[Lee London]

Hi everyone,

This is my first post here, and I have read the forums some time.  I currently have two rentals, and I want to move into multi-family apartments in the Seattle area.    I am a data nerd, and I am looking for maintenance and operating costs for multi-family units.  Specifically, I am trying to build a bottoms up model for operating costs.  I want to model the expected, minimum, and maximum repair/maintenance costs that I can expect during the year.  To do this, I need a significant amount of data to build the models. Does anyone know of a data set that provides this information?  

Thanks!