A general range will suffice.

This need not be expensive, sometimes just doing a slightly better paint job, or a feature wall, or painting kitchen cabinets will suffice. 

For example, if you put in granite countertops and cheaper ones would have sufficed.

Suffice to say I have a lot of reading ahead of me, not a bad thing.

Even if lost in mail, your certied copy of recorded doc will suffice to resell.In His time, not yours.

Are you sure your insurance company has an issue with it being without tenant for a short remodel period and a normal rental policy with rent loss coverage won't suffice?

WE worked on that for a few years and created the parcels. because the logging roads already existed and would suffice for rural resi roads all we did was survey and plat...

You can also use a copy of a bank statement of someone you knows you and trusts you who has sufficient funds in their account (with their permission of course), this is called a verification of deposit and in most cases will suffice in place of a proof of funds letter.

So even if you have an old certificate, it may not suffice for today's standard.Good luck!

I am mostly concerned with keeping track of this information for both purposes mentioned.  1- to ensure I am making progress (which doing quarterly would suffice).  2- for lending purposes.