We have no recurring income but have passion to do it.

You capitalize value and subtract the immediate repairs to arrive at a fair purchase price.The accrual numbers, however, are recurring monthly/annually.  

Is it a one time fee or recurring like in property tax? 

It will usually be over $3000 (and maybe substantially more) with taxes, insurance, maintenance, recurring CAPEX, management, marketing, etc.

You will have to identify and resolve the moisture source or it is going to recur.

Will F.My suggestion is having a contractor (or handyman) look at your units and give you a set price per unit type for the work you describe and say that this will be a recurring gig if he continues to do a good job.

But it seems sleazy to me, reminds tangentially of the infomercial scam where they give you the first month of product for free but you have to sign up for the recurring monthly shipment.

When a neighbor told me it was a recurring problem for the past year, I begged the apartment manager to let me out of the lease which she generously agreed to.

I texted Kent a minute ago just to confirm costs for this post and it is $995 one-time and has no monthly recurring fee.

No recurring expenses other than taxes and insurance.