I made a fair profit, left the property better off than I found it, and had a great tenant.

If it's a larger organization, feel free to inquire about their different staff qualifications.2.

This also means that with a larger down payment, the monthly debt service is less, thus increasing cash flow.

short-term and vacation destinations are in general is most profitable but is most vulnerable at times like now.many places have 30 day minimum restrictions and that trend will continueSo yes corporate rentals are by far the best combo but you may need to do your own marketing/networking to get corporate clients.since i do this as a side gig, I needed to be more passive so I let Airbnb and VRBO do all the marketing for me.  

The ones that do work out have been purchased at good prices which leave room for profit.

It's really about larger commercial properties but I think a lot of it applies to smaller multi-family.

This is only an issue if you work with larger banks and they sell off the debt to Fannie / Freddie.

Even if it looks like I'm making great profit each month on rentals (anywhere from $200-400 after putting away 15% into savings and 8% on management) and yet the ROI is below 8% and our realtor said it needs to always be at least 8%.

Nope, as a landlord, I want to choose who lives in my place and hold all the cards.And if I wanted to share the cards with someone it would be a PM with a business and insurance, not a person wanting to make a profit by raising the rent above market rate. 

Ok so lets be realistic, obviously new investors or amateurs aren't going to be able to get professional investors to give a majority profit on new ventures , but what is the best way to start a partnership percentage speaking?