Many of these were lost in tax sales, and the ones that they got re-performing underwrote loan mods at low single digit interest rates during ZIRP and could not resell them at a profit once interest rates were hiked.

If so you may have some full doc options which have the best rates typically and terms.Like others have mentioned you have DSCR loans too but this only allows you to purchase non owner occupied properties (not primary residence or second home occupancy type properties).

In one building I saw rates of $50/night. 

No pocket listings = agents aren't even calling for new leads anymore, rising interest rate has nothing to do with an agent's ability to generate leads.If you mean multifamily apartments, 5 units and up, some of those agents will know, but not many until you are over 10 units which are more listed by only commercial brokers which I agree do understand seller finance.

They can help assess the market value of the property, considering its condition, and suggest the best sales strategy.Direct to Investors or Wholesalers: While 'we buy ugly houses' companies often offer below-market rates (as they typically look for deeply discounted properties), reaching out to local real estate investors or wholesalers could be a worthwhile option.

How do you evaluate the increase (or decrease) in price of the land in question down the road?

Rising interest rates, slim margins, and unexpected costs can kill a deal fast.

Are $300/squares for GAF HDZ good rates.

I'm interested to hear about this due to rate hikes and optimism in the real estate world coming in the year ahead! 

We were discussing options for payment as we don’t have a lot of capital at the moment, however they have a property that has a bit of equity we could tap into, but they already have a favorable interest rate.