Unless you come in with a great loan like VA that allows you to put nothing down and get a low interest rate.

Cost prohibitive and no linen service) and claiming per the condo declaration the developer has exclusive rights to housekeeping since it's a condo hotel and will not allow us to hire cleaners given his exclusivity. 

Then, jump on your property manager for allowing this situation to happen.  

Can anyone recommend lenders who will allow for getting a mortgage in the name of an LLC for purchasing a mixed use building in Philadelphia.

In general the IRS does not allow married couples to deduct home mortgage interest on loan balances above $1,000,000 ($500,000 for single).  

They also have a free service called rentalizer, that allows you to enter any address and if they have info for it, they can guesstimate how much you may get as a AirBnB landlord.There are a lot more sources and blogs dedicated to this, so a search on google for "airbnb best markets" can give more details.Hope this helps!

Assuming you live in Sacramento, CA and your lease allows for it, I would be airBnb'ing the sh*t out of that apartment.

Account Closed rolling over your $75,000 in your 401(k) plan into a Self-Directed IRA would allow you to avoid the "dummy tax" and let you use the funds to purchase real estate.

In my town, we have what's effectively considered "allowed non-conforming properties" which are exactly like you discussed...multi-unit buildings in single family zones, etc because of grandfathering.

I don't know if this is allowed... but I just bought a 63k house in IL and used Busey Bank.