Hello @Dustin65
What were your neighbours complaining about in terms of your listing? Were your guests partying and disrupting the neighbours with late night noise/anti-social behaviour/their cars? @Dustin65
Unfortunately if you advertise your place as a party pad then you will attract the sort of guests that like to party, make noise and have lots of vehicles coming and going.
I didn't quite understand the reference to the fire marshal and adult website (where you advertising your listing for adult style parties?) in relation to your guests?
Large groups of guests coming and going in their cars in a residential area can be quite disruptive so there would be some sense in restricting numbers in response to neighbour complaints. Guests aren't always honest when you ask whether they are breaking your house rules (such as only parking on your property) so I would take the fact they say they aren't parking on the street with a pinch of salt 🙂
It's always a risk buying somewhere purely as an STR investment particularly when it is a large house, as larger properties tend to be harder to fill and attract a party crowd which is never terribly welcome if you have close by neighbours.
If you are struggling to fill the place doing STRs perhaps LTR or a conversion to split up the property might be a solution/