The roof is caving in and a lot more. 

Hello,I have a building with a flat roof which needed to be replaced. 

This includes examining the structural integrity, plumbing, electrical systems, roof condition, HVAC systems, and any other significant features.Title Search: Hire a title company or attorney to perform a title search on the property.

Last night after work I had to fix a water heater on one property, a water line leak under a sink at another property, and work on an HVAC unit at a third property.

In that case, you have to break down the rents vs. liabilities, show that the mechanicals, roof and everything is in good shape or have reasonable repair costs laid out, you need to know the appreciation potential, and the comps.

IE roof repair spread over # of units rather than just 13.

Example flat roofed churches or old elementary schools.  

How does your insurance company know you need to fix the roof?

-Has no crawlspace (common for older properties) so we couldn't see the foundation-Drywood termite/wood decaying fungi damage seen on all the windows/doors/parts of the beam on the exterior, parts of roof decking and rafters in the attic-Old leaks/moisture damage seen in the ceilings and attic-Parts of the roof has patch work-Roof doesn't have any permits on record (don't know how old it is)Seller's offer to me:-Fumigation treatment for drywood termites (tenting the house)-Replace and repair all damage wood throughout the house-Replace the entire roof with a new permit-Replace one window in every room (not all)-Pay for a structural engineer to inspect the foundation-Offer to get quotes for repairs and have a 15-20K budget to make all repairs, house is 500K.

Our biggest challenge was putting on a new roof ourselves.