Essentially, the dirt around the slab had started to accumulate and was now over the edge of the slab against the siding.

Meaning she lost 100 per month, per unit, accumulating to 9,000 for the year, which looks like 7-8 units.

In the winter the walls were cold and there was so little air circulation that black mold accumulated behind the furniture.

Yes, absolutely you should change them, as per the consensus of all who chimed in with solid reasons to support their replacement.Aesthetically, it looks much nicer too, coupled with the fact that it's a tax deductible expense that you can write off as well for upkeep.It's not a lot of money from a cost perspective, but, these little fixes accumulate and make an impact with regards to deductions at tax time.

That said, once you have all the costs accumulated, you could spend the $100 (or so) and take the matter to small claims.  

Then the total rent, tax free due to depreciation and cumulative accumulated depreciation losses,  is around 7000/month (at present) will be used for my life along with Social security and 401k/IRA RMD.  

Hi BP Community,I bought a duplex in 2009 in San Diego and have accumulated equity (on paper), but it has never cash flowed.  

Vents do accumulate lint and other debris over time and should be cleaned periodically.

I have a specific addendum in my Florida leases regarding using "reasonable efforts to the dwelling unit in such a condition as to prevent the the accumulation of moisture and the growth of mold." 

You're knocking out huge chunks of Mortgage with the Heloc and thereby eliminating huge chunks of principle so you never accumulate interest on that portion of compounded mortgage.