Ensure the sublease is explicitly permitted in a written agreement with your friend and aligns with local STR laws.

The need for building permits in the counties is limited to plumbing, HVAC, & electrical. 

The agency granted a permit for repairs to make the Pomona Street property structurally sound last month, she said.The vacant, dilapidated house at 915 Dauphin St., meanwhile, was listed as having a market value of $200,000 in a February 2020 RAD document, about three years after DDH Fund paid $27,000 for that property when images on the Atlas property-data website show it was in better condition.Those asset-value calculations are behind RAD’s big stock-value jumps.

Duplex have different zoning that may permit additional units.

Depending on the construction, you have to do major upgrades on electric, plan for plumbing for apartments which may not be permitted in the area for the sewer or septic.

However, I will always contact the owner as soon as time permits.

They usually require experience and they are lots of docs needed from architect drawings to a lot of permitting. 

Generally, there are more prospective tenants who may behave this way with lower-priced rentals.

Duplex have different zoning that may permit additional units.

I started prospecting the interior around 2 years ago.