As @Robert Steele mentioned - I think there's a much higher likelihood that the tenants will waste your time than actually follow through on the purchase.

OSHA 35.95Walker's building estimators reference 76.95Standard building code 60.00Contractors ManualSpan tablesDesign values for joist and raftersUnemployment Comp.Standard specs for ready mixLien lawsContracting lawsApplication and finishing gypsum boardTax LawsFair laborWorkman's comp All tests from GCCC contractors exam PricelessHandling, installing , bracing trusses 9.95Handling and erecting steel joist 22.95Code of standard practice for steel buildings/bridges 13.95All books and papers are in great shape.

@Ron Steele  personally I prefer tile.

Or just walk up and down these areas on a nice day to the glorious smell of weed wafting the air while kicking the bottles of steel reserve and/or colt 45 out of your way....watch out omar coming!!!

Laminated wood flooring and mid to high end stainless steel appliances. 

Mathmatically you will find gold in your own backyard vs rusted steel in many other far way places.

Matt Lefebvre By fire doors I mean steel doors for each unit and at the top and bottom of staircases

Containers on both ends and connected with stick or steel build in the middle.

The countertops will be Steel Gray granite.

Why buy a fourplex, when just slotting yourself into 5+ units drops the cost per square foot by at least $100?