You can do this for a predetermined amount of time and cost.

Reach a predetermined number. 

Were you able to stay within your predetermined budget? 

I believe someone had utilities included in the rent since its one meter then if utility bills went over a pre determined amount then the tenants were surcharged equally.

Stepped Increase EscalationWith a stepped increase, the amount of your lease will increase periodically a pre-determined amount.

He told me to never go above that pre-determined bid price because auctions can get emotional...

All else aside, given the amount of rent you could be charging it may be an idea to sit down and develop a long-term (2-4 year) budgetary plan for the unit/complex so that you can 1)gradually increase rents to a more uniform standard--as one member stated, "if they are all comparable units, there shouldn't be a drastic difference in the rent amounts" 2)eventually get all the units with equivalent or comparable upgrades (to keep things even with the neighborhood comps based on ammenities), and 3)ease your mind about the financial plan and trajectory of your complex (so you can just follow a predetermined plan and adjust when needed as time progresses).

Do I get the house/rent and I give them back rehab costs with a predetermined interest?

Each group is pandered to with different a psudo gin-ed up problem (advertised to), and given their supposed savior national candidate to (hopefully) vote for in a primary, and then the actual primary votes do not really matter and the "Seller" chooses the predetermined runner for the National Election (hoping that because the SJW's "Felt" support for their interim media propped up (false) savior, they will Vote for the "Sellers" chosen National Candidate.In a nutshell, it seems one way to stop those local's who align themselves with the "Seller" from implementing these laws, is not educating the locals (they are missing the point of this and actually solving the made up problem), might be to somehow appeal to the National part of it.

This number will vary with the timeline since the timeline criteria is based on a predetermined set of financial goals...which in tern is based on either total personal debt items to be paid off, or cash flow needs for specific monthly bills.