Single family properties can add one and multi-family properties may be able to add more. 

With rising interest rates but still high home prices people a lot of people are thinking of staying in there current house (with 3% 30 year fixed mortgage) but might need to add on or simply remodel.

Do our regular rent increase and then add on an extra $100 or $200 because you have to chase the rent Let the tenant know now that their rent will increase significantly if you have to chase them for the rent every month. 

Installed an A/C to bring up value and will eventually add on an additional master bathroom.

Recognize that in California, single family homes can add one detached ADU and one attached ADU or junior ADU.

They do not upcharge for various add ons as much as Showmojo.  

@Carlos PtriawanI will add one more, everyone and their brother will start a debt fund - many will be used as an alternative to a capital call on their own real estate deal.

I like the pontoon boat rental idea as an add-on service for your STR - on decent-sized lakes, pontoon boat rentals can easily bring in $200-250 for a half day rental or $400-500 for a full day rental, so you could make a tidy little profit off of this kind of add-on amenity. 

With time appreciation and rent increases will produce a good return on leveraged coastal Ca cities RE.For those with a bigger pot to invest…If you do value add on residential, currently commercial residential is beaten down but non-commercial is not.  

Initially I had a feeling you didn’t really know what you’re talking about but now it’s crystal clear you have no idea what your saying and you are more than likely just another misleading , Detroit PM nightmare like 99% of the other PM’s in Detroit with all sorts of hidden fees, secret add-on’s who work against the tenant rather then with them so they end up vacating and you guys salvate over another nickel and dime placement fee.The question ‘why’ in your first comment has absolutely NOTHING to do with it I am simply sharing my experiences.