Can I increase the rent from what was advertised, PRIOR to a lease signing and with full disclosure?

It can also advertise for sale if you are not going to hold the flipped property or you can tenant and sell. 

How do you advertise your vacant units?

For example, let's say that you have an 80k rehab budget, and that budget is broken down into four separate 20k chunks.With most hard money lenders, even if they advertise 100% rehab financing, you would be responsible for 'floating' that first 20k chunk; you would do the 20k of work, and then be reimbursed for that amount assuming the inspection goes well.It's something that you'll want to consider in calculating your capital outlay and cost.Hope this helps,Michael

Look for people/companies advertising "trash out" like for foreclosures and evictions and/or search for junk removal.

If you advertised the home touting its energy efficiency and low monthly electric bills, perhaps you could charge a higher monthly rent to recoup some of the investment, but that's a big "perhaps".

They have rental signs put around the property advertising so I made some rental signs advertising my units as well however the management company takes mine down.

That's maintenance, repairs, mowing, collecting rent and running a nationwide multiplatform marketing campaign. 

It also gives you the flexibility to advertise single apartments or the entire building to sleep large groups. 

They aren’t going to waste money on advertising if they are a scam.