Contract for Deed Offer on a Duplex

[Mariquita De Mira]

I live in the Twin Cities and have been looking at duplexes to move into and house-hack to get started with real estate investing. I made a 6-Month Contract for Deed offer on a duplex located in a B/C area with 3 bedrooms and 1 bath in each unit priced at $290k. It appears it is in solid condition and move-in ready. The bottom unit has been occupied for 6 years by the same tenant who gets some assistance to help cover her rent at $1600/month which about covers the monthly mortgage. She just recently signed a new lease and is a good tenant. When I move out, I could potentially collect $3200/month in rent from both units. 

The reason my agent and I arrived at a Contract for Deed offer is because I still need to sell my house before I can buy my next property due to my DTI ratio and I need more time to prep my house for sale. However, the seller of said duplex already has an FHA offer but was willing to consider mine. Our offer was $290k, $20k down, 4.25% for 6 months. He countered with $295k. But after my agent and I started to review what I need to bring to the table, it appears I need another $5k for closing costs, inspection, etc. I have exactly $20k and no more unless I want to move some money from my brokerage account or borrow it. However, if I were to do the former, I will have no money for reserves or emergency funds and I keep thinking how the worst can happen like a furnace going out, I get laid off, etc. and now I have no net to fall on or umbrella to cover me.

As much as the numbers seem to work I don't have all the money on hand to do this deal. However, I'm wondering in this hot market with most rents not meeting 1% rule and in this case it is more than 1%, am I letting a good deal pass me by or will there be more deals down the road, I just need to be patient. This is a huge financial decision and I'm terrified of making a mistake: spending money I don't have to buy an investment or passing up a great investment opportunity, hence it's worth moving heaven and earth for an extra $5,000. 

Sorry for the long post and appreciate any guidance on this major decision. Thank you very much in advance!