If I understand correctly; the seller would receive 80% ($40,000) directly from the mortgagee at closing and would enter into a personal agreement with me for the 20% down payment ($10,000) in which he would be reimbursed separately from my mortgage payments at a separately agreed upon rate and term?

For value add you need to buy deep, have reputable contractors, and understand different financing products + creative finance.  

There's just so much wiggle room doing this, especially since you're dealing with a family member who completely understands the finances of the park. 

You are using both tax sale and mortgage foreclosure in your posts, so I can understand why this post went unanswered for so long.If we are talking the upset tax sale, the simple answer is that the liens remain in place.If we are talking judicial tax sale, the simple answer is that the liens will be divested (at least for those where proper service of the notice of tax sale was properly delivered to the lien holders).Which leaves mortgage foreclosure.

Since you're open to markets beyond NYC, you might want to connect with local investor meetups or REI groups in those areas to build relationships with agents, wholesalers, and lenders who understand the nuances of each market.If you're looking to break out of analysis paralysis, maybe start by narrowing down one or two target markets and running numbers on actual deals.

The bigger thing is understanding that pre-approvals give you a ballpark, but your actual rate gets locked only when you have a signed contract.

Unlike seasoned investors or repeat homebuyers who understand how to move quickly, many younger buyers approach the process with caution, often leading to missed opportunities.Why Gen Z Is Struggling to Keep UpOne of the key reasons Gen Z buyers are struggling is delayed decision-making.

But I understand where I’m at now, and am willing to work for free until I can provide such value.A little about me.

I don’t really understand all the recognition it’s been getting.

We’re seeing occupancies in the 70%-75% range.Happy to jump on a call to better understand your needs and also take a much deeper dive into the options.