They were perfectly acceptable 20 years ago, but now many areas are limited to one guest per calendar month. 

Trying to cash it out has been challenging -- exchanges go down at inopportune times, and Coinbase's limits mean you can only cash out 780,000 a year -- and that's if you time selling precisely when your limit reaches maximum.There is a huge exchange risk. 

Valuing your time and understanding your limits and skills will make a big difference in the equity you build, the quality of the work and your sanity. 

I have considered adding an ADU in the back, but since I am limited to 75% of the main house square footage, this is also probably not worth it.     

The appeal of student housing to rental investors lies in its ability to provide a steady income stream, especially in areas with high enrollment growth and limited new construction.Given your experience and the quality of your properties, you should find a receptive market among rental investors.

I'll send you a PM to chat further. we have up zone that just happened a lot of parcels allow for higher limits.

Here's why:The Multi-State Chess Game:• Client had properties in 3 states• Each state has different deadlines to assess taxes• Federal changes trigger automatic state assessments• Timing the response saved $45K in state taxes🏠 Real Estate Investor Pro Tip:States can't assess back taxes if their statute of limitations expires before federal changes finalize.

Lincoln Place: Still somehow in city limits but more suburban neighborhood.

Quote from @Stuart Udis: @Robert Ellis Location Location Location...There is limited land supply in markets with high demand and high barriers of entry.

If you have a credit card with a high limit or a line of credit on the existing duplex that might give you some wiggle room.