They are both in private communities with plenty of amenities to offer all year round.

@Ian TyndallWhat other amenities are other STRs in the area are missing? 

I would argue market and submarket dynamics are far riskier than property class, i.e. a C property from amenities standpoint in an A area will, all else being equal, out perform an A asset in C market.Was the property that you invested in that lost money marketed as a C property?  

The SFR + ADU is worth less than a Duplex because the ADU is viewed as an amenity rather than an additional unit so your appraisal will look for other SFRs with ADUs and provide line item adjustments for homes with and without ADUs much like having or not having a pool or a garage.

Properties without a view or unusual natural amenity are down as much as 35 percent.

In my little burg were we are building Canby Oregon there are 35 new builds pending and I have 18 of them .. mine are all the most expensive . the production guys stripped there houses down to lower price we added amenities and high end stuff and raised prices..

It's people-intensive and blends the amenities of an airbnb  with a boarding room/inn concept.  

., refrigerator, stove, dishwasher, microwave)]Utilities: [Indicate whether utilities are included or not]Pet-Friendly: [Specify whether pets are allowed or not]Outdoor Space: [Describe any outdoor amenities like a backyard, patio, or garden]Additional Features: [Mention any additional features like hardwood floors, fireplace, or walk-in closets]Property Highlights:Spacious and well-lit interior with [describe any notable architectural details or design elements]Open concept living and dining area, ideal for entertaining guestsFully equipped kitchen with modern appliances and ample cabinet spaceRelaxing master suite with a private bathroom and [mention any unique features][Add any other notable highlights or selling points of the property]Location and Neighborhood:Situated in the heart of [City, State], our home is conveniently located near [mention nearby amenities such as schools, parks, shopping centers, and public transportation options].

There are larger options but these tend to need some TLC.For your initial search, Zillow can give you an idea of home prices and amenities in your price range.

I'm considering the purchase of a large home and converting it into a 4 or 5plex for Senior Independent Living with some amenities.