Additionally, we have no interest in adding additional collateral against this loan to the same entity.

My question is, what is an attractive ROI for a private lender to lend up to $3MM on a 1 year term, collateralized on the land and improvements?

Be able to have cash to ride out the bubble crash.5) Be careful with bank loans and cross-collateralization.

I was able to use collateral from another house and I came up with the rest on my own (friends/family/personal money).

Account Closed Where are the properties located that you will place as collateral for the LOC I may know of a bank.

However, most mortgages don't let you transfer the collateral. 

For example, if I get a hard money loan on a property and they have 1st Position, I thought there was no way I could sell the property without satisfying their loan first (and thus they have secure collateral for their loan).  

Call around to some local banks and ask if they do a multiple collateral mortgage (aka stacked collateral).

Two separate loans that are secured by the same collateral which is worth considerably more than the combined total of the notes.

Deed of Trust or Mortgage:  This is the document that collateralizes the piece of real estate to the loan, so that if the borrower doesn't fulfill their obligations, the lender can foreclose.I would highly recommend having a real estate attorney create these documents for you, though a competent closing agent may have the ability.