Hello Utah BP Family! <3I have a bunch of random thoughts, questions, & scatterbrained ideas regarding building an ADU that I'd love some guidance/feedback on if anyone is willing or has knowledge/expertise on!...

I had a hard time finding a lender that would lend on this due to the two dwellings for one loan, but the realtor suggested Southwest Funding.

The dwelling is 2522 sq. ft. total.

Each carrier will evaluate the property and determine what the cost will be and that's why each carrier has a different premium for the property with generally 85-90% of the coverages being the same.If you feel the dwelling is low see if they have a guaranteed home replacement endorsement that can be added or 150-200% dwelling coverage to truly protect yourself in the event of a total loss.The market is going to be like this until 2025 most likely so the easiest thing to do is raise your deductible without sacrificing coverage.

I don’t know the layout of the dwellings.

Unfortunately breaking into an unoccupied dwelling is typically the lowest degree of burglary.

Tenants understand that the owner or PM has the right to periodically inspect the dwelling and if it is found that the tenant is destroying the home the Section 8 office can be contacted and the benefits will be placed at risk along with possible eviction.  

Now a landlord (and architect), I wouldn't build out the space without the second stair since it really is a safety issue/liability (especially in case of a fire) if anything were to happen.Full excerpt of building code below:According to the Chicago building code on egress requirements, the third story above grade plane within a dwelling unit [which in this case is the duplex-up unit], all the following conditions must be met:1.) the building is equipped throughout with an automatic sprinkler system2.) the floor area of the story does not exceed 1600 sq ft3.) the dwelling unit has an exit that discharges directly to the exterior at the level of exit discharge.Your third story attic space is unlikely to exceed 1600 sq ft, but you'll probably find the sprinkler system to be cost-prohibitive.

Quote from @Drew Sygit: @Yanting Wang many investors are buying, "build to rent" properties.They are all being told that in buying a new construction property, they shouldn't have maintenance issues for 5-10 years, which will increase their cashflow/profit.Well, tenants have a way of breaking things, not taking care of problems and letting them become maintenance issues, and this is on top of the fact that most new construction properties require several warranty repairs by the builder in the first 12 months.As others have pointed out, you must live in the property for the first 12 months for an FHA mortgage or take your chances with committing mortgage fraud. do a new construction multifamily don't buy a single family for BTR the numbers are garbage. density is the only win for economies of scale, micro units as well. small, well designed multiple dwelling properties are superior. 

I have sellers of a t6-8 zoned property that would take 1 million right now I'm sure in Wynwood Norte. we can go 12 stories through max incentives and put 60 dwelling units on it. we entitle the land it becomes worth 3 million, then you have construction numbers, sale prices, etc. miami is crazy. the best way to make money from a professional in this industry for 13 years who lives in miami and looks at deals in columbus and miami is development and getting involved in early development opportunities of raw land in urban settings where there is very little risk and pushing high density.