@Hamidou Keita I would recommend if duplexes are limited if you can get a 4-5 bedroom house and either rent by room for house hack or splitting a big house into 2 and adding a kitchenette and separate entrance as a more cost effective ROI option 

Purchase price: $630,000 Cash invested: $120,000 Gutted this property, brand new electrical, furnace, propane, finished basement to create separate unit.New garage with rental unit.

I could do separate loans on the land and mobile home but I think that may not be the best option. 

Electric is metered separately from the utility. 

The property is a 3 bedroom, 2 bath (one of the rooms is the master with its bathroom and access to go outside), with a separate garage and an unfinished garage unit.

Or you can sell it, split the equity, and go separate ways.I'm not a fan of borrowing from family/friends unless all parties are honest and everything is documented in a written contract.

The numbers I use for an STR and long term are different so I would probably analyze them separately and then put it all together.

Another was to partition the mobile home park and the self storage and the commercial tenants into 3 separate sales.

The seller has the two lots legally separated, but due to deed restriction imposed by the subdivision development, found that building a house on the “tennis court” lot was not allowable. 

I use this feature for separate accounts for each property that is under the same LLC.