Is your goal to pay down that $50k credit line as quickly as possible, or have the tenants pay it down gradually with their rent payments, and get a different credit line for the next property (if that is even possible). 

Rent prices have gradually risen as well.  

You could end up with 3 vacancies,, Might be better to gradually raise the rent.. $90. to 100 and in next six months the balance. 

But it seems changes start to gradually take place and a lot of old houses are being renovated and upgraded.

I have a passion for community development, and I would like to see this neighborhood gain a feature which will maintain the community's value, even as the early 80's homes enter a period of gradual decay.

It looks like all of your money will gradually filter into their pockets and you will be left holding an empty bag.

Things are gradually improving in the county.how are you getting 200k at 5-7%? 

You can gradually assume more responsibilities but that is definitely the best place to start.

Since you've already got a lot of the up-front expenses taken care of (e.g. furniture), you can always do my phase-in plan in reverse if necessary... start with them all as STRs, and if for whatever reason in the future you no longer want all 5 of them, you can gradually phase into LTRs (or mid-term stays like @Michael Nelson suggested).  

If they are quite a bit below market value, and pay on time every month, I would gradually increase the rent until it is at market value.