Note: that RUBS are common practice in some markets while other markets not so much. in not RUBS friendly market usually owners include/ add them to the rent. 

I work in construction and it's a fairly common scenario....

It could be lighting, it could be the camera angle, it could just be an older house that you can only make patch work look so good, or it could be they maintenance guy isn't that good with patching. 

Leverage is a force multiplier: It can move a project along quickly and increase returns if things are going well, but if a project’s loans are under stress – typically when its return on assets isn’t enough to cover interest payments – investors tend to lose quickly and a lot.As a general rule, leverage should not exceed 75% of the total property value, including mezzanine and preferred equity, because both of these types of debt sit ahead of common equity in payment order.

One central boiler with multiple zones is very common. 

We found a property management company but before signing the contract, noticed that they put "owner to pay $395 to secure lease renewal of current tenant""owner to pay 8% per month but subject to $100 a month minimum payment" of gross revenues DUE (not paid) prior to monthly disbursements""if premises are vacant at any time during this agreement, then owner shall pay manager $100 per month for management of premises including supervision of maintenance"It doesn't seem like these terms fit for managing our simple duplex rental. 

And managing employees/maintenance/contractors.

Contributions into new entities after completion of a 1031 is a fairly common practice in the world of partnerships and mergers.  

Normally there is a maintenances agreement for shared lines.

@Henri MeliThank you for your response; it seems the variable rate is quite common@Temitope AdebayoSo are you saying I'm not charged with paying off the HELOC, but only the interest that's associated with the total amount?