As noted by Michael and Greg above, risk tolerance is important, so equity or debt, pay back structure, timeline of investment.I would approach it more as a fact finding mission (soft ask at first). 

Turnkey is an option, but it's low profit and no learning, soft passive income.

If you notice any soft spots or warping at all plan on pulling it out. 

I received several GC quotes that ranged from 400k to over 1 mil in rehab costs alone, which means this doesn't include soft costs (i.e. closing and design costs).

Some creative financing ideas:Ask the seller to loan you 100% of the purchase Do an installment down payment agreementGive the seller a note - pay him a percentage of the rent you will be collectingGive the seller a post dated check - post dated for 2 years for the down paymentOffer a blanket mortgage on another property you ownAsk seller to repair something (we call it the"Front Porch clause) instead of him doing it, he gives a check in that amount that it will take to do the repair - you endorse the check and give it back to him as the down-payment.Borrow SOFT MONEY on another property you own or from a relativeBe a limited partner on the deal - they refi or borrow money on their property - you make the payments over time with a nice interest and don't forget a buy out clauseAsk your girl friend, your Mother or drinking buddies - offer a free apartment for a limited amount of timeAsk the owner to finance 100% of the deal - keep him in as a limited partner Offer 20% more for the building if the seller will take back a principal only mortgage (that is without interest) offer a balloon payment and split notes.Ask the seller to let you manage the building for a year - collect the rents and make improvements from the rents receivedOwner financing with split notes (details on this to come)Proposal marriage to the owners daughter - make friends with the seller's wife - let him know you really want this property - beg for help - tell him you are a nice person - just getting started Offer a Hybrid offer - offer less - improve the building and give seller 20% of the profitsTry a Delayed Settlement with right of possession and subject to the mortgage - you make payments until settlement 1-2 years later.

Don't run a hard pull- use CreditKarma or something that will do a soft pull on your credit.

The house has a raised foundation and the crawlspace is pretty clean, but the ground is soft In a circle with at least a 12 foot diameter.  

I hope your agent has a soft touch when it comes to negotiations :)Since all your closing costs are already being covered by the seller, you have limited options with how to structure any negotiations. 

With prefabs/modules you may be able to short cost some soft costs such permitting. 

the last few post are talking about seller subordination.. in a flat market that can work in a stimulated or growing market your going to have a hard time getting a seller to do that.one there are tax implications that need to be thought out by the seller.How we do it is pretty straight forward.last deal went like this.Raw dirt 500k plus 100k to get it to prelim plat  we pay cash for all of that no debt no loan.1 million to improve it to shovel ready... we borrow that in first position.. 23 improved lots appraised for 2,990,000  bank loan 1 mil or  33% of ra dirt.. you can squeeze sometimes and get a bank to go 50%  they did give us the 100k on the first draw for our soft costsnow we get vertical loans of 240 k or so to build the homes  plus 60k for the lots or about 300k.. so new loan for 300k.this loan retires the banks horizontal loan.. and we own the last 5 lots free and clear since we are paying an accelerated  pay down.. houses selling for 450k   so right at a 70% ARV loan on new construction which is about where they like to be.now our loans are a tad higher because we put in 10k fluff and 10k interest reserves.. so as we build out we do not have any monthly payments.. so in theory we got interest reserve on the horizontal loan and we have interest reserve backed into the vertical.. so we did this all with ONLY 600k in cash.. profit a little over 2 million end of the day in about 26 months total..