For me, hiring a professional or a company is much safer and apply its percentages to the rest.

Until I’ve walked the property, reviewed systems, and understood tenant quality, the only honest way to get to a rough number is applying a percentage proxy.

I was wondering though lets say someone wants to sell but not completely could someone buy like a percentage of there park ?

No such thing as a "safe" percentage.

For the listing side you can see if they'd discount their percentage.

Have you thought about what percentage split would be fair for the signing partner vs you doing all the work? 

Obviously, if you are on the East or West coast, that percentage would be much higher, potentially 50% or more of the cost. 

In reality, I wasn’t setting aside the right percentages—especially considering the age of some of my properties.That’s been the biggest shift in my business over the past few years.Now my portfolio runs like a business.When something breaks or needs attention, it’s already been accounted for.Planning didn’t make things easier.It made them predictable — and that’s where the real peace of mind comes from.Would love to hear how others here think about planning for CapEx and vacancies in their portfolios.

What are some typical numbers or percentages you’ve seen in practice

I'll chime in on this one and I will preface this with the statement that I am a devout Christian, but what I have learned in banking is that huge percentage of the folks that use those little "God Bless" statements are often scam artists.