Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

I'm trying to sell some prime building lots right now and all of the builders I've talked to don't want them mostly due to being backlogged on work thanks to labor shortages and not wanting to deal with the huge hassle and time commitment/expense to get a building permit.Ironically, politicians in the past have contributed to the problem by actually going to job sites to round up and deport workers because many are undocumented.

Am I better of just running my own rental comps instead of using the HUD User site?

Land acquisition, entitlement and zoning, permitting and site plan, construction budgeting, and then at that point, we do the last piece which is cost of financing.

Settlement shall occur within, or at such other site as the Buyer may select, provided that the Buyer shall have given the Seller at least five (5) calendar days advance written notice thereof.  

List subscriptionIf you search the BP site, you will find alot of information on each subject.What you CAN NOT do is tell someone, "Hey I'll give you $1,000 if I end up buying the house"Feel free to msg me anytime.Keep in mind I am not an attorney, and this is not legal advice.

Links to your three other posts on this same topic so readers can see what's already been discussed:https://www.biggerpockets.com/forums/61/topics/551577-backyard-homes-produced-in-chinahttps://www.biggerpockets.com/forums/617/topics/551580-china-built-backyard-homes-socalhttps://www.biggerpockets.com/forums/61/topics/537480-tiny-homes-produced-in-chinaThis sort of house is an interest of mine, though I'm more interested in building them on-site with a 3D printer and local materials.  

I would like to know which sites are reliable to do some market research on population growth, and income on zipcodes, and counties in Delaware.

Steel site.

So, those 13 clients weren't impressed enough (or reminded) to write a review on the most public buyer site out there.And no, they are not all this year.