There is an old house with some code violations and a tenant in it.

Below is a promo flyer I received from them; again not enough reviews to move forward confidently with this lender.

Used to code for a living way back when, but now I've been swinging a hammer in construction for almost a decade.

Do you charge and how much.Acceptable Vacancy Rate - we own a reasonable # of doors in the city of Milwaukee - not great areas but not horrible either.Thanks in advance State laws dictate what you can charge for a late fee (in DE we have a 5-day grace period and the maximum allowable late fee is 5% of the rent amount) so look at your landlord-tenant code for this.As far as pet fees, it is also capped per the landlord-tenant code for our state at one month's rent.Too many variables to address your vacancy rate question.  

Some area codes I try to avoid like 53206 but overall, it’s a hot market. 

Here are some steps to get started:Market Research: Identify areas with strong growth potential, low vacancy rates, and high rental demand.Financial Analysis: Evaluate the cost of construction, potential returns, and your financing options.Legal Considerations: Understand the zoning laws, building codes, and permits required for new construction in your chosen area.Sustainability: Consider incorporating green building practices to increase the property's appeal and long-term value.The Bottom LineWarren Buffett's investment in new construction underscores a broader trend in seeking alternative avenues for growth and diversification.

For years we used various brands - Olympic, Glidden, etc - and they are continually changing their base coats so that you can have the paint code mixture but it never mixes up consistently.

There is obviously a formal lease, and we also supplement with a room mate agreement which outlines the more specific things like overnight guests and expectations in dispute resolutions/ cleaning/ care for the home and appliances, etc.I haven't received one formal "LL request" email yet, other than a formal 30 day notice in the event of a move out, which is usually after they've come talked to me in person about it to begin with. if there's an issue, it tends to be pretty limited to "hey, we have this shower rod falling off"... which im usually here to deal with (and tbh most of the time they like to fix it up with me), and it doesnt need to turn into a big thing. as for keys, i have the house on a yale smart lock, so 'handing over keys' is just official move out, walkthrough of the room for damages, and then I can delete their access code and access to the smart home systems without having to re-key the house. 

Did I know anything about construction, zoning, code enforcement, etc?

Cost of construction is high and you may be paying extra to match 2024 building codes rather than a remodel/addition.