In a loose sense, I would call any lender a "partner" too, since they will require not only your monthly payments, and will require regular reporting as well on the operations of the property (but this is a more semantic and philosophical discussion).But, ways you can try to come up with that money: refi your home and/or investment properties.  

Sometimes, money can motivate people to actually clean up their properties.  

He explain that to remove the dust, I could clean the areas very well.

We used to do pet deposits, but now we collect a one-time "pet fee" upfront that is designated for damage repair and cleaning on the back end. 

The place has been clean and quiet until a new tenant moved in last month.

No chemicals, no electricity, refill and clean after each stay, and “environmental friendly”.

Worse case it could be converted to regular apartments.

Inspect regularly, then remove the tenants who can't maintain their units in decent condition.

Capital Expenditures (10-15% of Income)Rule of Thumb: Reserve 10-15% of your income for capital expenditures (CapEx) like roof replacement, HVAC systems, or major renovations.Why: Regularly contributing to a CapEx fund ensures you have the cash on hand for significant improvements or replacements, preserving the value of your properties.5.

I have a few realtors that recommend me regularly and they would not take a referral bonus even if I offered one.