It is my first investment property purchase contract for a duplex.

With a proper contract and good tenants, I had no issues. 

I seems like it will be difficult logistically, but is it legal?

I'm hoping to get something under contract by the end of this year.

L.I write about No Bank No Credit financing.If you want to play in the sandbox of no money no credit, you need:Private Lenders (knowledge of self directed IRAs)JV Partners (splitting profits w cash partners)Creative Financing (sub2, land contracts, installment sales, TIC contracts, using notes, etc)I used to live in Mt Kisco, Westchester.I get what you are trying to do.Good luck!

She said that the seller's attorney instructed him to only agree to seller financing if the land contract was in my husband's name, not his company's name.

(this is the only thing we need to negotiate - EQUITY)I will send the seller a contract of sale (and a copy to you) - I always use my "Skinny Contract Offer" at a price we both agreed to -  Your job will be to get comps - look at the property - make an inspection and determine that the offer I make is at a price where we can make a reasonable equity profit.

We have an idea on how much we can put the property under contract for, but we aren't too sure on what we can turn this around for.

If he has the best bid, you sign a contract with him and pay him accordingly.

In essence you contract the intermediary to purchase the property on your behalf.