Very basic build for the kitchen and bath.

For example: Ceramic Tile throughout the entire home, 2 inch Quartz countertops in kitchen and baths, 2 toned real wood cabinets just to name a few. 

It needed a new roof, new septic tank, water heater, well pump, hardwood floor refinishing, light reno in kitchen (paint cabinets, replace countertops, 1 new appliance), full bathroom renovation on 2 bathrooms cleaning up wood rot on siding, painting exterior.

High end houses you can't just settle for what is available you need to give the customer what they want even if that means not finishing the kitchen for 4 months while you wait for the cabinets that are on back order or you have to turn away your insulation guy because your electrician hasn't started yet because he got covid.

House is 1280sq ft with 2 bathrooms, kitchen, and laundry in the garage.

And it is only 1500 sqft for both units, so rent will be limited based on the small size and you still have to maintain kitchens and bathrooms for two units, which means high maintenance cost to rent ratio. 

There are also 2 indoor cameras: one in the kitchen to make sure nobody forgets to turn off the gas oven or leave the sink full of dish.

New paint, Floors, Kitchen, Bathrooms, Hardware, Windows, Light Fixtures, and Appliances.

Larger-scale projects like full bathroom remodels, kitchen remodels, or primary suit additions tend to cost homeowners significantly more and return much less on the investment.

But what you're envisioning will be very costly and it won't look right when you're done unless you are redoing the whole kitchen cabinetry.