If you're looking at a debt service loan, 15% is the minimum for a purchase but it's much more common (and rates are better) at 20-25%. 

I still am on the lists of all the major wholesalers and still show up to showings occasionally on properties that might have enough margin for me but have not purchased recently from a wholesaler.Just like Adrien says, they provide a service of marketing and negotiating contracts for you.

Should I combine the marketing of my PM company and my buy/sell RE services in one?

Quote from @Natalie Allie: Hey Michael, I am in the Detroit area and work with investors for PM services and renos.

I figured if I was going to owe Capital Gains, a HELOC would make sense since you don't have to pay Capital Gains on debt service.

Usually the type of work has to be dealing with the real estate itself, not just providing a service that is applied to a part of the house/building. 

If you want these types of service, then you should should look at the pay structure to see if it makes sense for all parties.3.

If you provide excellent housing and excellent service it is likely that your turnover rate will be lower resulting in less future vacancy.

Quote from @David Ondrich: Here's a link to my company's application: https://northstaronline.managebuilding.com/Resident/rental-a...We use Buildium as our software service.

Third party servicing company for $35/mo handle taxes, insurance, escrow, tax forms, statements etc.