I've heard people putting the rehab on credit cards but heard that can make refinancing tricky.

Then renegotiate price, credits, repairs etc based on your findings before your inspection period ends. 

Both tenants have a good credit history and no previous evictions.

Has anyone used Unsecured Credit Lines or Cards on a Recent Project with success?

Credit score of 620 or above, currently employed, house under $285,000, and caught up on your taxes.

Do you have someone you have turned away due to lack of credit even if they qualified on income?

@Jim Adrian it’s a complete guy, sans most of the flooring, because the place has been vacant for 10 years, the plaster ceiling is falling down everywhere, walls need to be reconfigured to make it fit a SFH instead of a Duplex better, Mechanicals all need replacing due to rodent/critter damage, and city code will require electrical service upgrade and new water service, etc… It’ll be a fun project, has good bones, just the soft meaty stuff inside that sucks.

There are programs for you to qualify for this but you need better credit and more down. 

Regular landscaping/yard care (mowing, edging, trimming, fertilizer, weed control) will be provided by ____(check one)____ [   ] Landlord  [   ]  Tenant .For all Tenants:a.Tenant agrees to keep yards, walkways, patios and decks clear and to keep premises free of junk and debris.b.Tenant accepts liability for all landscape damage and/or replacement of such, if caused by neglect, abuse or lack of water.c.Tenant may plant the beds adjacent to their dwelling to their liking, but only with those plants that are of appropriate size and type for the beds.All plants brought or caused to be brought to the property by Tenant will be cared for by Tenant.d.Tenant agrees not to cut or prune trees, hedges and shrubs.This will be Landlord’s responsibility.e.Tenant agrees to properly dispose of all plant debris and agrees to not leave such on the property.f.Landlord will consider special Tenant requests for planting and removal of plants, shrubbery and trees, but reserves the right to determine the make-up of the landscaping.g.Tenant agrees not to grow marijuana on the premises, indoors or outdoors.For Tenants of single family homes only: a.Tenant agrees to mow, water, and keep the grass, lawn, flowers and shrubbery thereon in good order and condition, applying fertilizers and weed retardant as needed. b.If Tenant fails to keep the landscaping in good order and to follow these guidelines, Landlord reserves the right to hire a landscaping service at Tenant’s expense (after a 10-day notice to perform covenant).c.Landlord reserves the right to restore the landscaping to its initial condition, as it was at the time Tenant began occupancy, or if improved during Tenant’s occupancy, to the level of such improvement.

But you'll get to establish a relationship with a local bank (or several) and potentially open the door to obtaining a business line of credit down the road once you have built up trust with the lender.