Being a part of a company that eats, sleeps and breathes knowledge of Real Estate, Investing and construction has been the best thing for us.

I'm not pursuing opportunities in Butte at the moment, but I'm sure this will be a big help to @Justin Ringer, who breathed new life into this thread. 

The location determines all the long-term income characteristics.To narrow your search, I recommend eliminating locations unlikely to be good long-term investment locations using the following filters.

I am trying to find software that would filter out the entire county and show me all the in-fill lots in neighborhoods. 

As @Grant Pitarys mentioned above, HMLs may be a good option.Below are three ways to generate a list of prospective lenders;1) BiggerPockets --> Network --> Hard Money Lenders --> Filter by state2) Local REIA/meetup events, where you can get referrals from local investors and network with HML reps.3) Google "Hard money lenders Washington DC" and explore the results.Additionally, you may explore options with an individual private lender you meet.The 2nd option above, local REIA/meetup events, is a reasonable way to meet and form a relationship with them.Lastly, be sure to put out in front of lenders that you received the home from your grandparents, in real estate jargon, this means it was not an "arms-length" transaction, which can have certain implications depending on the lender you work with.Hope this helps,Michael

They can pull them up by owner or by property and filter them by any date range your require.

However, during inspections, we'll check and change batteries or filters as needed - the costs are minimal and the protection is great.

, closet doors falling off, cabinets need rehab, stove falling apart, botched paint job in a room or two by tenant, sinks that don't work right, stoppers missing on sinks and bathtubs, appears to have done some do-it yourself repairs by wrapping tape around a pipe leak for example, air filter appears to be very old.The only positive is that he doesn't have trash/garbage all over the place.

Mostly because only a very few people were doing it, the people who were had the cash to close; if we wanted to “flip the contract” almost every title company would do a double closing, and some very motivated lenders were willing to finance the end buyer’s total purchase price.Now, I receive 5-10 texts weekly wanting to buy my properties; God knows how many phone calls (unanswered), spam (junk filtered) emails galore, and if I happen to inadvertently answer the phone call I get a person who can barely communicate in English reading in monotone from a prepared generic script where it’s totally obvious that I would be wasting my time with someone who is mass marketing looking for a seller who knows nothing about the value of their property.One individual called me a few times(years ago), had researched what I owned, how much I owed, and the likelihood I would be amiable to an offer.  

Below is the list I came up with (not filtered, so I'm certain there are duplicates from your list above).